The correct order of electron flow during photosynthesis begins at the top with the location where electrons are first excited in noncyclic electron flow and are as P680 → Cytochrome complex → Plastocyanin → P700 → NADP⁺.
Photosynthesis is the method by which organisms, mostly plants, generate organic compounds (like carbohydrates, fats, and proteins) from inorganic materials (water and carbon dioxide) utilizing the energy of light.
Photosynthesis can be divided into two stages: light-dependent reactions and light-independent reactions. The light-dependent reactions, which occur in the thylakoid membrane, are the first stage of photosynthesis.
Chlorophyll a absorbs light energy that energizes electrons, which are passed through two photosystems, PS II and PS I, as well as an electron transport chain. In this process, ATP is produced through the process of photophosphorylation.
The electrons are first excited in noncyclic electron flow at P680, electrons are then transferred to the cytochrome complex, which is then transferred to plastocyanin, then transferred to P700 and finally, electrons are then transferred to NADP⁺, completing the photosynthesis cycle.
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An action potential causes depolarization of the T tubule membrane.T/F
An action potential causes depolarization of the T tubule membrane. The given statement is true.
DefinitionPositively charged sodium ions (Na+) enter the fiber, depolarizing the local membrane. This causes an action potential to spread to the rest of the membrane, depolarizing the T-tubules as well. Ca++ ions that were stored in the sarcoplasmic reticulum are then released as a result of this (SR).Action potentials are transported into the interior of muscle fibers by the T-tubules, where they activate voltage-gated channels known as dihydropyridine receptors (DHPR). The amount of calcium that enters the muscle fiber from the extracellular space is much lower than it is in cardiac muscle (via the DHPR).The ryanodine receptors (RyRs) in the SR open and release calcium, which stimulates contraction. These events are triggered by the action potential, which invades T-tubules and opens L-type calcium channels.For more information on action potential kindly visit to
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When evaluating web-based sources, you should consider which of the following?a. recency b. relatedness c. superiorityd. connectedness
When evaluating the web-based sources, one should consider the recency. These include different examples such authenticity, credibility, content, and timeliness. Thus, the correct option is A.
What should be considered when evaluating web-based sources?In order to determine the quality of a web-based source, one must take a few factors into consideration. Here are a few examples:
Authenticity: This indicates whether the information found on a website is accurate or not.
Credibility: The website must have an established reputation and be known to provide accurate information.
Content: The content must be informative and not misleading.
Timeliness: The information should be up-to-date and accurate in the present day.
In conclusion, recency should be considered when evaluating web-based sources.
Therefore, the correct option is A.
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Which feature unites paramecia, malarial parasites, and dinoflagellates into a single group? A. The use of cillia. B. The presence of a nucleus
The feature that unites paramecia, malarial parasites, and dinoflagellates into a single group is the presence of a nucleus. The correct option is B.
Paramecia are single-celled microorganisms that belong to the phylum Ciliophora. They are unicellular and are characterized by the presence of cilia and two types of nuclei: micronucleus and macronucleus.Malarial parasites are the organisms that cause malaria, a disease that affects millions of people worldwide. The parasites belong to the Plasmodium species and are transmitted through the bites of infected female Anopheles mosquitoes.Dinoflagellates are a group of single-celled aquatic organisms that are characterized by two flagella, one wrapped around their waist and the other extending behind. They are photosynthetic and are found in freshwater and marine environments.Therefore, the feature that unites paramecia, malarial parasites, and dinoflagellates into a single group is the presence of a nucleus.Therefore, the correct option is 'B' the presence of a nucleus.Learn more about Paramecia https://brainly.com/question/2784341
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in prokaryotes, how do translation and transcription occur?
Translation is the process of using the genetic instructions in mRNA to produce a polypeptide chain while Transcription is the process of copying genetic information from DNA into messenger RNA (mRNA).
In prokaryotes, transcription is the first step of gene expression, in which the mRNA is produced from the DNA template during which, the enzyme RNA polymerase binds to the promoter region of the gene, reads the DNA template strand in the 3' to 5' direction, and synthesizes the mRNA with complementary base pairing. The mRNA then exits the nucleus and is translated by the ribosomes in the cytoplasm where the ribosome reads the mRNA codons in the 5' to 3' direction, and binds transfer RNA (tRNA) molecules that carry the corresponding amino acid. The ribosomes join the amino acids together in the correct order to form a protein which is called translation.
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which molecule carries the protein code from the nucleus to the ribosome?DNARNAADP
The molecule that carries the protein code from the nucleus to the ribosome is RNA, specifically a type of RNA called messenger RNA or mRNA. Here option B is the correct answer.
mRNA is synthesized from DNA during transcription, which occurs in the nucleus of eukaryotic cells. The DNA serves as a template for the mRNA, which is complementary in sequence to one of the strands of the DNA double helix. Once synthesized, the mRNA molecule carries the genetic code from the DNA to the ribosome, which is the site of protein synthesis.
At the ribosome, the mRNA is read in groups of three nucleotides called codons. Each codon corresponds to a specific amino acid, which is added to the growing protein chain according to the sequence of codons on the mRNA.
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Complete question:
Which molecule carries the protein code from the nucleus to the ribosome?
A - DNA
B - RNA
C - ADP
Animals of one common phylum are NOT bilaterians but are eumetazoans. What phylum is it? A. Chordata B. Annelida C. Porifera D. Cnidaria
Animals of one common phylum are NOT bilaterians but are eumetazoans is cnidaria. The existence of cnidae in these organisms distinguishes them.
Some of these species include corals, sea anemones, jellyfish, and hydras. Asymmetrical organisms belong to the phylum Porifera. Radially symmetrical organisms are found in the phyla Cnidaria and Ctenophora. All of the following phyla, including Platyhelminthes, exhibit bilateral symmetry. Bilateral symmetry, often referred to as plane symmetry, is exhibited by 99% of all animals and is common in the majority of phyla, including Chordata, Annelida, Arthropoda, Platyzoa, Nematoda, and most Mollusca. Animals from the phyla Porifera, Cnidaria, Ctenophora, and Placozoa make up the non-bilaterian animals.
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Gregor Mendel described several traits in pea plants in which a dominant trait masked a recessive trait. Two such traits were plant height (T = tall, t = short) and seed shape (R = round, r = wrinkled). Match each genotype below with its expected phenotype.
tall and round
The genotypes match with phenotypes as follows in the plant pea experiments:
Short and Wrinkled = ttrrTall and Round = TTRR, TtRr, TTRrTall and wrinkled = TTrr; Ttrr.Short and round = none Mendel's Experiments in pea plantsGenotype refers to the genetic makeup of an organism, while phenotype refers to the outward expression of an organism's genetic makeup. Dominant refers to an allele that masks the effect of another allele, while recessive refers to an allele that is only expressed in the homozygous state (when two copies are present). Therefore, in the given question, T and R are dominant alleles while t and r are recessive alleles.
Given the Genotype above, the expected Phenotype is as follows:
Short and Wrinkled = ttrr
Tall and Round = TTRR, TtRr, TTRr
Tall and wrinkled = TTrr; Ttrr
Short and round = none
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motor output is guided by sensory feedback with the exception of ______ movements.
Motor output is guided by sensory feedback with the exception of option D) ballistic movements.
For effective sensory-motor control, skeletal muscle feedback is essential. To maintain both dynamic and static muscle tone, specialized receptors in the muscle, such as muscle spindles, Golgi tendon organs, and joint feedback, give this feedback.
The spinal level of motor neurons connected to spinal reflexes receives a large portion of this sensory feedback, which is crucial for maintaining muscle tone.
Muscle contractions that reach their maximum velocities and accelerations in a brief amount of time are referred to as ballistic movement. They have rapid contraction times, great force generation, and rapid firing rates.
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Complete question is:
A) innate movements
B) unpracticed movements
C) practiced movements
D) ballistic movements
E) reflexive movements
How many pounds of producers would a cow need to eat to make a 3-pound steak for me to eat
To produce a 3-pound steak for human consumption, a cow needs to consume much more than just 3 pounds of vegetation.
The amount of food a cow needs to eat to produce a certain amount of meat depends on several factors such as the breed, age, and diet of the cow. On average, it takes approximately 6-8 pounds of feed to produce 1 pound of beef. Assuming an average feed conversion ratio of 7 pounds of feed per pound of beef, a 3-pound steak would require approximately 21 pounds of feed for the cow to consume. This feed would come from grazing on grass or being fed hay, silage, or other types of feed. The producers that a cow needs to eat to produce beef can range from grass and other plants to processed feed that contains grains and other supplements.
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Some protists, such as amoebas, are surrounded only by their plasma membrane whereas others such as diatoms and foraminifera are surrounded by?
The protists such as diatoms and foraminifera are surrounded by protective glassy shells of silica.
Diatoms are single-celled algae that come in a variety of shapes and sizes. They're found in both freshwater and saltwater environments, and they're a crucial part of aquatic food chains.
The diatom cell is bordered by a silica shell, which gives it a distinctive frustule or "valve" shape.
Foraminifera is a kind of single-celled protist with a shell, similar to diatoms. Foraminifera shells are made up of calcium carbonate or agglutinated material (particles of sand or other hard materials).
In conclusion, the protists diatoms and foraminifera are surrounded by silica or calcium carbonate shells, whereas others such as amoebas are only surrounded by their plasma membrane.
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what is the key characteristic of a transformed cell?
The correct option is A, The key characteristic of a transformed cell has acquired tumor-forming properties.
A cell is the basic unit of life. It is the smallest structural and functional unit of an organism, capable of performing all the functions necessary for life. All living organisms are made up of one or more cells, and they can either be prokaryotic or eukaryotic. Cells carry out various functions, including energy production, protein synthesis, and DNA replication. They also maintain homeostasis and respond to changes in their environment.
Prokaryotic cells are found in bacteria and archaea and are characterized by lacking a membrane-bound nucleus and other organelles. Eukaryotic cells, on the other hand, are found in animals, plants, fungi, and protists and are characterized by having a membrane-bound nucleus and various organelles that carry out specific functions within the cell.
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Complete Question:
What is the key characteristic of a transformed cell?
A) has acquired tumor-forming properties
B) is producing toxins affecting neighboring cells
C) is producing budding viruses
D) has undergone chromosomal rearrangements
E) is infected with a lytic virus
what two nitrogenous bases have two ring structures and are called ?
The two nitrogenous bases with two ring structures that are found in DNA are called purines.
The two types of purines are adenine (A) and guanine (G). Purines are one of the two major types of nitrogenous bases found in DNA, the other being pyrimidines, which have a single ring structure.
The purine bases are characterized by their ability to form hydrogen bonds with specific pyrimidine bases, which allows for the complementary base pairing that forms the basis of DNA's double helix structure. Together, the base pairing of purines and pyrimidines helps to maintain the stability of the DNA molecule.
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Describe the three different types of bipedalism. For each one, be sure to discuss the frequency of bipedal locomotion, describe the extent of bipedal adaptations, provide at least one sample primate who practices this type of bipedalism, and describe why the sample primate uses this form of bipedalism
There are three main types of bipedalism: facultative, obligate, and facultative-obligate.
Facultative bipedalism is the most common, and it occurs when primates walk bipedally but also move around on all fours. Examples of primates with facultative bipedalism include baboons, chimpanzees, and gorillas. These primates use bipedalism as a way to transport objects, to feed, and to reach things that are otherwise out of reach.
Obligate bipedalism occurs when primates move around on two legs only and do not move around on all fours. Humans are a classic example of obligate bipedalism, as we are almost exclusively bipedal when we move around. Other primates who exhibit obligate bipedalism include macaques, vervets, and lorises. They use bipedalism to navigate through dense forests, which is helpful for accessing fruits and other resources in the treetops.
Finally, facultative-obligate bipedalism occurs when primates occasionally move around on all fours and at other times move around on two legs only. Gibbons and siamangs are examples of primates who exhibit facultative-obligate bipedalism. They use bipedalism as a way to move quickly between trees, and they use all fours when they are climbing.
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During an El Niño event, the South Equatorial Current reverses direction and flows over the top of northern portions of the Peru Current, causing
answer choices
warmer surface ocean waters along the northeast coast of South America
warmer surface ocean waters along the northwest coast of South America
cooler surface ocean waters along the northeast coast of South America
cooler surface ocean waters along the northwest coast of South America
During an El Niño event, the South Equatorial Current reverses direction and flows over the top of northern portions of the Peru Current, causing warmer surface ocean waters along the northeast coast of South America.
An El Niño event is a climate phenomenon that causes ocean temperatures to rise in the tropical Pacific Ocean, affecting weather patterns around the world. An El Niño event is triggered by an unusual warming of the tropical Pacific Ocean off the coast of South America. El Niño warms the surface ocean waters along the northeast coast of South America due to the South Equatorial Current reversing direction and flowing over the top of the northern portion of the Peru Current. This reversal causes the warmer water to be displaced from the central Pacific towards the eastern Pacific, leading to the warming of the ocean temperatures along the eastern Pacific coast including South America. Therefore, during an El Niño event, the South Equatorial Current reverses direction and flows over the top of northern portions of the Peru Current, causing warmer surface ocean waters along the northeast coast of South America.
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HIV infection leads to AIDS when ___ during viral replication lead to the production of viral particles that can infect ___ cells, allowing cancers and opportunistic infections to invade the body of the patient.
HIV infection leads to AIDS when errors during viral replication lead to the production of viral particles that can infect immune system cells allowing cancer and opportunistic infections to invade the patient's body.
Human immunodeficiency virus (HIV) is a virus infection that damages the immune system over time, leading to acquired immunodeficiency syndrome (AIDS). As HIV infects and destroys white blood cells, the body becomes unable to protect itself against infection and disease, making it more susceptible to opportunistic infections.
AIDS reduces the number of CD4 T-cells in the body and when these fall below the normal level they make people vulnerable to infections and cancer.
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how do mutations happen spontaneously without any outside influence
They occur when errors are made during the transcription phase of protein synthesis or DNA copy. Environmental factors are the source of other mutations. A mutagen is anything in the domain that can change something.
Spontaneous mutations are those that take place without the intervention of external factors. They could be the result of mistakes made by DNA polymerases during replication or repair, mistakes made during recombination, the movement of genetic elements, or DNA damage that just happens by itself.
Either mistake during DNA replication or exposure to mutagens (such as chemicals and radiation) can cause mutations. Random variation in a population is caused by spontaneous mutations, which occur at a rate of 1 in 105 to 108.
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which example best illustrates a gene-environment interaction?
Exposure to cigarette smoke and genetic susceptibility can result in a higher risk of lung cancer, illustrating a gene-environment interaction.
The interaction between the environmental factor of cigarette smoke and the genetic factor of predisposition for lung cancer results in an increased risk for lung cancer. People who are exposed to cigarette smoke (environmental factor) are more likely to develop lung cancer, but this risk is further increased if they have a genetic predisposition for lung cancer (genetic factor). In other words, the interaction between exposure to cigarette smoke and genetic susceptibility results in a higher risk for lung cancer than either factor alone. This illustrates a gene-environment interaction.
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which lymphoid organ(s) serve(s) in removing aged and defective blood cells and platelets from the blood?
The spleen serves in removing aged and defective blood cells and platelets from the blood. A lymphoid organ is an organ in the body that is involved in the immune system. These organs include the thymus, lymph nodes, spleen, bone marrow, and tonsils.
The thymus is a gland located near the top of the breastbone that produces T cells, which are important for immune system function. The spleen is a large organ located in the upper left part of the abdomen that filters blood and helps remove old or damaged blood cells. The bone marrow is the spongy tissue inside bones where blood cells are produced.
Lymph nodes are small, bean-shaped organs that help fight infection by filtering lymph, a fluid that carries immune cells throughout the body. The spleen functions as a blood filter. It is the primary organ in the body for removing old red blood cells from the bloodstream. It also serves as a blood reservoir, which means it can hold onto blood and release it into the bloodstream when needed.
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some animals are more sensitive to changes in their environment than others. the presence and abundance of certain species can be used to gauge stream quality. these species are referred to as .
The species that are used to gauge stream quality are referred to as Bioindicators.
Bioindicators are living organisms that are used to gauge stream quality. They are utilized to track changes in the environment by responding to changes in environmental variables, including water temperature, water chemistry, and habitat availability. Bioindicators can be used to evaluate the effects of management techniques on ecological health, and they can also be used to establish baseline data for ecological health. The presence and abundance of certain species can be used to gauge stream quality.
Bioindicators are species that are delicate and responsive to the effects of environmental degradation. These organisms can be a variety of species, including macroinvertebrates, bacteria, algae, and other microorganisms. They provide an insight into the health of the environment by indicating any variations in the biological communities that rely on them for survival.
Bioindicators are an essential tool for detecting water pollution and environmental degradation. Bioindicators are used by ecologists to observe the biological diversity and stability of an ecosystem. They serve as an early warning system that signals the presence of environmental disturbances, and they can assist in determining the effectiveness of various environmental management techniques.
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What force allows a plant to become more rigid and stand upright?answer choiceso turgor pressureo geotropismo photosynthesiso phototropism
Turgor pressure is the force that allows a plant to become more rigid and stand upright. Turgor pressure is the pressure exerted by water inside the plant's cells against the cell walls. The water enters the plant's cells through a process called osmosis, where water moves from an area of high concentration to an area of low concentration.
When the plant's cells are filled with water, they become swollen and exert pressure against the cell walls, which gives the plant its rigid structure. This turgor pressure is especially important for plants that grow upright, such as trees and flowers, as it helps them maintain their shape and resist external forces such as wind and rain.
Turgor pressure is also essential for plant growth and development. Without adequate turgor pressure, plants may wilt, and their growth may be stunted. Therefore, maintaining proper water balance and turgor pressure is critical for the health and survival of plants.
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Which of the following statements is TRUE? A) The lagging strand is synthesized in a semiconservative fashion while the leading strand is synthesized in a conservative fashion B) Synthesis of the logging strand requires more helicase enzymes than synthesis of the leading strand C) The lagging strand has a higher mutation rate than the leading strand D) The leading strand is replicated continuously for the entire length of the chromosome, while the tagging strand has multiple origins of ruplication E) All statements are correct
The following statement is TRUE: The leading strand is replicated continuously for the entire length of the chromosome, while the tagging strand has multiple origins of replication. The correct answer is Option D.
What is DNA?DNA stands for Deoxyribonucleic acid, which is a molecule that holds most of the genetic information or instructions for the growth, development, functioning, and reproduction of all living things. DNA is a long polymer consisting of monomers known as nucleotides. DNA's structure and composition are unique and self-replicating. DNA replication happens before cell division in all living organisms. The process is vital for the continuation of genetic information from generation to generation.
DNA replication is a process that involves many enzymes, which work together in a highly-coordinated fashion to ensure that DNA's sequence is replicated accurately. The replication process starts at the origin of replication and proceeds in both directions, resulting in the formation of two replication forks. The replication process is continuous in the leading strand, while it is discontinuous in the lagging strand. The leading strand is replicated continuously for the entire length of the chromosome, while the tagging strand has multiple origins of replication.
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Pumpkin patch: Suppose we plant pumpkins in a garden where half of the plants are shaded: Then, to test a new fertilizer; we fertilize the plants in full sun and do not fertilize the plants in the shade In the fall the fertilized plants yield more, bigger, and prettier pumpkins Which of the following did we fail to include in the experimental design? Establish control group Direct control of confounding variables Compare groups of the explanatory variable Establish measurable outcomes to determine the effectiveness of the explanatory variable
In this study, we fail to include in the experimental design is the control group.
What is a fertilizer?We have established that to test a new fertilizer in a garden where half of the plants are shaded, we need to fertilize the plants in full sun and do not fertilize the plants in the shade. During the fall season, the fertilized plants yield more, bigger, and prettier pumpkins.
There are various considerations that are needed to create a successful experimental design. However, one of the most important considerations is establishing a control group. We failed to establish a control group in our experiment.
The control group is a group of individuals or samples which are used as a baseline or reference for comparing the results of the experiment. In the context of this question, the control group would be a group of plants that is not given any fertilizer at all.
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vitamins often act as them______ or function as components of themThese types of molecules interact directly with _____to either allow the reaction to occur or by making the reaction occur efficiently For example, the vitamin _______is used in the production of NAD Recall that NAD* helps carry high-energy electrons to the electron transport chain to generate ATP. This means that NAD+ functions as an)______enzyme(s)niacincoenzyme(s)riboflavin
Vitamins frequently serve as coenzymes or as their constituent parts.the vitamin is riboflavin.
Vitamins are essential organic compounds that cannot be produced in sufficient amounts by the body, so they must be obtained from the diet. They play a crucial role in metabolic processes such as the formation of red blood cells, immune system function, and neurological function.
The human body requires 13 vitamins: A, C, D, E, K, and eight B vitamins, including riboflavin and niacin.
Coenzymes are organic molecules that help enzymes catalyze reactions. They are not enzymes, but they work with enzymes to ensure that reactions proceed quickly and efficiently.
They are similar to vitamins in that they cannot be synthesized by the body and must be obtained through the diet. Some examples of coenzymes are NAD+, FAD, and Coenzyme A.
NAD+ stands for nicotinamide adenine dinucleotide, which is a coenzyme found in cells. It helps cells generate energy and is involved in many metabolic processes.
NAD+ functions as a shuttle for high-energy electrons in the process of respiration, transferring them from other molecules to oxygen, which then generates ATP.
NAD+ is made up of two nucleotides joined by phosphate groups, and it requires niacin and riboflavin to be synthesized.
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Which natural disaster starts over the ocean, pushes storm surges onto shore, and causes flooding?
Flood
Tornado
Hurricane
Wildfire
a cell with two complete sets of chromosomes is a cell.
A cell that has two full sets of chromosomes is said to be diploid. Two full sets of chromosomes are present in a diploid cell.
The majority of human cells are diploid, with 23 chromosomal pairs totaling 46 chromosomes. This consists of a pair of sex chromosomes and 22 pairs of autosomes. Chromosomes are found in the nucleus of cells in both plants and animals, including humans.
There are 46 chromosomes in all, including 22 pairs of numbered chromosomes (autosomes) and one pair of sex chromosomes (XX or XY). DNA may be precisely duplicated during these cell divisions thanks to chromosomes. So, once more. Our cells' nuclei include chromosomes, which enable precise DNA duplication during cell division. This guarantees that our internal processes go forward.
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Correct Question:
A cell with two complete sets of chromosomes is a cell called _____.
coenzymes are nonprotein compounds that are required for the activity of certain enzymes. one critical coenzyme central to metabolism is nad . in fact it is one of 5 coenzymes required by______ , the critical enzyme for producing acetyl-coa. nad is synthesized from_____ as was discovered to be critical for health by two american scientists, ______ , in the early 20th century. dietary lack of this critical molecule produces pellagra, characterized by the following symptoms: _____ . people with these problems were found in parts of the u.s. where diets lacked vegetables and consisted principally of corn. interestingly, soaking the corn in ____, a common practice in mexico, releases the critical coenzyme from proteins, making it bioavailable,
Coenzymes are nonprotein compounds that are required for the activity of certain enzymes. one critical coenzyme central to metabolism is nad . in fact it is one of 5 coenzymes required by pyruvate dehydrogenase, the critical enzyme for producing acetyl-coa. nad is synthesized from niacin (vitamin B3) as was discovered to be critical for health by two american scientists, Joseph Goldberger and Tom Spies, in the early 20th century. dietary lack of this critical molecule produces pellagra, characterized by the following symptoms: dermatitis, diarrhea, dementia, and death. people with these problems were found in parts of the u.s. where diets lacked vegetables and consisted principally of corn. interestingly, soaking the corn in alkaline, a common practice in mexico, releases the critical coenzyme from proteins, making it bioavailable,
NAD is required by pyruvate dehydrogenase. Joseph Goldberger and Tom Spies discovered niacin (vitamin B3). Symptoms of pellagra include dermatitis, diarrhea, dementia, and death. Corn is soaked in alkaline.Coenzymes are nonprotein compounds that are required for the activity of certain enzymes. One critical coenzyme central to metabolism is NAD. In fact, it is one of the 5 coenzymes required by pyruvate dehydrogenase, the critical enzyme for producing acetyl-CoA. NAD is synthesized from niacin (vitamin B3) and was discovered to be critical for health by two American scientists, Joseph Goldberger and Tom Spies, in the early 20th century. Dietary lack of this critical molecule produces pellagra, characterized by the following symptoms: dermatitis, diarrhea, dementia, and death.People with these problems were found in parts of the U.S. where diets lacked vegetables and consisted principally of corn. Interestingly, soaking corn in alkaline, a common practice in Mexico, releases the critical coenzyme from proteins, making it bioavailable.
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Match each process to its description. Note: in order to complete the question and move on to the next one, you will need to drag one of the statements to more than one target! Drag each item on the left to its matching item on the right. Note that every item may not have a match, while some items may have more than one match. 1.separates sister chromatids. 2. results in diploid cells 3.separates homologous chromosomes. A) . meiosis Il B)mitosis C) meiosis I
The given description is related to the following processes:
Separate sister chromatids: Mitosis, Meiosis IIResults in diploid cells: MitosisSeparate homologous chromosomes: Meiosis IThe process of mitosis, meiosis I and meisosis IIMeiosis II and Mitosis both involve the separation of sister chromatids. In mitosis, this occurs during the anaphase stage, where spindle fibers pull apart the sister chromatids towards opposite poles of the cell. In meiosis II, sister chromatids are separated during the second round of division after the cells have already undergone meiosis I.
Mitosis results in diploid cells, this is because, during mitosis, the parent cell replicates its DNA, separates the sister chromatids, and divides the cytoplasm to produce two genetically identical daughter cells with the same number of chromosomes as the parent cell.
Meiosis I is the process that separates homologous chromosomes. During this process, the two homologous chromosomes (one from each parent) pair up and exchange genetic material in a process called crossing over. Then, they separate from each other and move towards opposite poles of the cell during anaphase I. The resulting daughter cells are haploid, containing only one chromosome from each homologous pair.
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Mendelian ratios are modified in crosses involving autotetraploids.
Assume that one plant expresses the dominant trait green seeds and is homozygous (WWWW). This plant is crossed to one with white seeds that is also homozygous (wwww).
1. If only one dominant allele is sufficient to produce green seeds, predict the F1 phenotypic ratio of such a cross. Assume that synapsis between chromosome pairs is random during meiosis.
2.Predict the phenotypic ratio of the F2 generation.
____ green : ____ white
3. Having correctly established the F2 ratio in Part B, now predict the F2 phenotypic ratio of a "dihybrid" cross involving two independently assorting genes, A and W, for this cross.
WWWWAAAA x wwwwaaaa
The F2 ratio would be:
____ dominant W and dominant A individuals :
____ dominant W and recessive a individuals :
____ recessive w and dominant A individuals :
____ recessive w and recessive a individuals
Phenotypic ratio of F1 is 4:0 (green: white seeds). Phenotypic ratio of F2 is 9:7 (green: white seeds). Phenotypic ratio of F2 of dihybrid cross = 9:3:3:1.
What is the phenotypic ratio?The F1 phenotypic ratio will be all green seeds, as only one dominant allele is sufficient to produce green seeds. This will result in a phenotypic ratio of 4:0 green: white seeds.
F2 Phenotypic ratio for the F2 generation, we will get a phenotypic ratio of 9:7 green: white seeds.
Parents- WWWW x A genotype produces all WAWA gametes, while wwww produces all wawa gametes. On crossing these parents, hybrid produced will be:
WWAW x wawA
Offspring genotypes: WWAW – green, WWAw – green, WwAW – green, WwAw – green, WWaA – green, WwaA – green, Wwaa – white, wwAW – white, wwAw – white, wwaA – white, wwaa – white.
F2 Phenotypic ratio of a dihybrid cross, the ratios are as follows
Parents - WWWWAAAA x wwwwaaaa
The possible gametes from the WWAW genotype are WAWA, WAWa, WaWA, and WaWa. The wawa genotype produces only wawa gametes. The multiplication of these two results in the following:
WWAW x wawa = WAWAaWAWa x wawa = WAWaaWaWA x wawa = WaWAWawa x wawa = WaWaWaAW x wawa = WawaAaWaAw x wawa = Wawaa waWA x wawa = waWAwawa x wawa = wawa
The phenotypic ratio will be the same as the F2 generation’s phenotypic ratio, which is 9:7 green: white seeds.
The F2 ratio would be 9 dominant W and dominant A individuals: 3 dominant W and recessive a individuals: 3 recessive w and dominant A individuals: 1 recessive w and recessive a individuals.
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place the events of the flint water crisis in chronological order.
The events of the flint water crisis in chronological order are:-
The water source for Flint residents was switched from Lake Huron to Flint River.Public protests and complaints broke out about health problems.City officials denied there was a problem.Researchers reported elevated levels of lead.City officials restored the water source to Lake Huron.Flint water is a term used to refer to the drinking water supply in Flint, Michigan that was contaminated with high levels of lead and other toxic substances. The crisis began in 2014 when the city switched its water source from Lake Huron to the Flint River without properly treating the water to prevent corrosion of the aging pipes.
Lead is a toxic heavy metal that can cause serious health problems, particularly in children and pregnant women. Exposure to lead can lead to developmental delays, behavioral problems, and impaired cognitive function. Other toxic substances found in the water included bacteria, carcinogenic chemicals, and disinfection byproducts.
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name a group of terrestrial plants that are haploid in their dominant generation.
Bryophytes are a group of terrestrial plants that are haploid in their dominant generation. bryophytes, also known as bryophytes, have a unique life cycle and reproductive strategy that involves alternating between haploid and diploid generations.
The group of terrestrial plants that are haploid in their dominant generation are called bryophytes. Bryophytes are an ancient and diverse group of terrestrial plants that have been around for over 400 million years.
Bryophytes are a group of non-vascular plants that are commonly known as mosses, liverworts, and hornworts. These plants are simple in structure and have an important place in the ecosystem. Bryophytes are the oldest land plants and were the first to colonize terrestrial habitats.The life cycle of bryophytesIn the life cycle of bryophytes, the haploid stage is the dominant generation. Bryophytes have a life cycle that is characterized by an alternation of generations between the haploid gametophyte stage and the diploid sporophyte stage.
The haploid gametophyte stage is the dominant generation in the life cycle of bryophytes. The gametophyte stage is where the plant produces the sex cells.The sporophyte stage is the result of the fusion of the sex cells produced by the gametophyte stage. The sporophyte is dependent on the gametophyte stage for its nutrition and development. The sporophyte stage produces spores that are released into the environment, where they can germinate and grow into new gametophytes. The cycle then repeats itself.
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