For the cross-bridge cycle to occur, calcium must be present in the sarcoplasm.
The cross-bridge cycle is the basis for movement and force production in muscle cells. Each cycle of myosin binds to actin and the movement of the thin filaments involves the hydrolysis of one ATP molecule.
To activate muscle contraction, tropomyosin must change its shape, exposing myosin binding sites on the actin molecule and allowing the formation of cross bridges. This can only occur in the presence of calcium, which is stored in very low concentrations in the sarcoplasm.
Bridges cannot cross-form without calcium because calcium allows the active sites to be exposed and without exposed active sites, bridges cannot form.
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In an asexual life cycle, cells reproduce by meiosis. fertilization. All of the answer choices are correct. meiosis and fertilization. mitosis.
Answer:
k
Explanation:
_____ provides employees with specific, identifiable knowledge and skills for use in their present jobs. a. Development b. Recruiting c. Networking d. Training
Answer:
D
Explanation:
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Drag the phrase to indicate which fossil fuel it describes. A phrase may be used more than once. (2 points)
coal: Oil: Natural gas:
:: formed at at the bottom of swamps
oil
:: made mostly of methane
natural gas
::made mostly of hydrocarbons
:: sediment, rock, and water apply pressure and heat to plant remains
:: formed at the bottom of the ocean where sediment, rock, and water apply pressure and heat
⠀⠀
The correct phrase for the word is the following:
Coal: sediment, rock, and water apply pressure and heat to plant remains.
Oil: formed at the bottom of the ocean where sediment, rock, and water apply pressure and heat.
Natural gas: made mostly of methane.
What are natural gases?Natural gas, when extracted, can contain a range of elements and molecules other than methane. A natural gas well may contain water, ethane, butane, propane, pentanes, hydrogen sulfide, carbon dioxide, water vapor, and, on rare occasions, helium, and nitrogen.
Therefore, the correct options are coal: 3, Oil: 5, and Natural gas: 2.
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Answer:
Sediment, rock, and water apply pressure and heat to plant remains is how coal forms. Oil is formed at the bottom of the ocean where sediment, rock, and water apply pressure and heat. Natural gas is mostly made from methane.
classify each mutation example as definitely positive, definitely negative, or most likely neutral. each category has two examples. you are currently in a sorting module. turn off browse mode or quick nav, tab to items, space or enter to pick up, tab to move, space or enter to drop. beneficial mutations neutral mutations harmful mutations answer bank
A beneficial mutation is one that has a good effect on an organism. These mutations are uncommon yet important. The benefit that a beneficial mutation provides the organism is passed down from generation to generation, increasing the chances of survival for the offspring.
Neutral mutations:
Neutral mutations are changes in DNA sequence that are neither beneficial nor harmful to an organism's ability to survive and reproduce. In population genetics, neutral mutations are mutations in which natural selection has no effect on the spread of the mutation in a species.
Harmful mutations: Mutations that are harmful can result in genetic diseases or cancer. A genetic condition is an illness that results from a mutation in one or more genes. Cystic fibrosis is a human example. A single gene mutation causes the body to produce thick, sticky mucus, which clogs the lungs and blocks ducts in digestive organs.
What is mutation?
A mutation is a change in an organism's DNA sequence. Mutations can occur as a result of errors in DNA replication during cell division, mutagen exposure, or viral infection.
What causes mutation?
Mutations can occur as a result of mistakes in DNA replication during cell division, mutagen exposure, or viral infection. Germline mutations (those that occur in eggs and sperm) can be handed on to offspring, but somatic mutations (those that originate in body cells) cannot.
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Full Question: Classify each mutation example as definitely positive, definitely negative, or most likely neutral. Each category has two examples.
Which region shows the population of cells with the highest amount of dna per cell?.
Compare the peaks in regions A, B, and C of the histogram for the control sample. Region C displays the cell population with the most DNA per cell.
The correct response is G1 for region A, S for region B, and G2 for region C. In addition to biology, region c displays the cell population with the most DNA per cell. As the S phase develops, the amount of DNA in each cell varies, giving the S phase cells a range of fluorescence intensities. Most cells are present during the G1 phase of the cell cycle.
Comparing the peaks in the control sample's histogram's regions A, B, and C, we can conclude that region C represents the cell population with the highest DNA content per cell.
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Your question is incomplete. Please find the complete question below.
In the control sample, compare the peaks in the histogram in regions A, B, and C.
Which region shows the population of cells with the highest amount of DNA per cell?
Region C
what feature of fats makes them hydrophobic
which bones unite to form the highlighted bone?
The highlighted bone is named the sternum. The sternum, which lies in the middle of the chest, is where the ribs connect to the body.
Which joint does the humerus's highlighted bone form?The humeral head's ball and glenoid's socket connect at the glenohumeral joint. The supraspinatus, infraspinatus, teres minor, and subscapularis muscles' tendons make up the rotator cuff, which joins the humerus to the scapula. Muscle and bone are joined via tendon.
What develops in the indicated curvature?When a child is able to sit up on their own, the lumbar curvature that is highlighted begins to develop. The structure in bold allows for head lateral rotation. The structure in bold allows for head lateral rotation.
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Researchers performing __________ insert a weak electric current into the brain to stimulate it. a. lesioning b. esb c. eeg d. pet please select the best answer from the choices provided a b c d
Researchers performing ESB technique insert a weak electric current into the brain to stimulate it.
What does ESB contain in psychology?
Electrical stimulation of the mind (ESB) is a method which includes the creation of a susceptible electric modern into precise places withinside the mind via way of means of the use of more than one microelectrode to use brief pulses of electrical currents supposed to imitate the herbal glide of impulses via the neural pathways.
What contribution do ESBs make to our understanding of the brain?
Electrical brain stimulation (ESB) is useful in a variety of settings, including neurosurgery and experimental research. Neurosurgeons can use this procedure to help doctors determine which brain tissue needs to be removed.
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Classify the examples as prezygotic or postzygotic barriers. Prezygotic barrier Postzygotic barrier Answer Bank A horse and donkey mate to produce a sterile mule. One bird species prefers open areas, whereas another bird species prefers wooded areas. One frog species mates in the spring, whereas another frog species mates in the summer. Individuals from two different species mate, but the resulting embryo dies before birth.
Prezygotic and Postzygotic barriers are reproductive isolation mechanisms, which avoid mating events or prevent viable and fertile mixtures between different species. Pre-zygotic barriers: One bird species prefers open areas, whereas another bird species prefers wooded areas. One frog species mates in the spring, whereas another frog species mates in the summer. Postzygotic barrier: A horse and donkey mate to produce a sterile mule. Individuals from two different species mate, but the resulting embryo dies before birth.
What is reproductive isolation?This is a mechanism through which different species or populations do get to mate and produce fertile offspring. This mechanism allows the accumulation of genetic differences and favors speciation.
Different barriers inhibit or interrupt the genetic flow between species.
Reproductive barriers are isolation mechanisms that prevent mating between two or more species. There are two types of barriers,
prezygotic ⇒ that avoids fertilization between individuals of different species, postzygotic ⇒ that impedes the zygote from developing and reaching the adult stage.Pre-copulatory or pre-zygotic barriers include:
Ecological or by habitat isolation; Seasonal or temporal; Sexual o ethologic; Mechanic; Gametes incompatibility.Postzygotic mechanisms barriers include:
Hybrid inviability, Hybrid sterility, Hybrid reduced viability or fertility, Cytoplasmic interactions.Examples,
Pre-zygotic barriersOne bird species prefers open areas, whereas another bird species prefers wooded areas (Ecological or by habitat isolation)
One frog species mates in the spring, whereas another frog species mates in the summer (Seasonal or temporal isolation)
Postzygotic barrier
A horse and donkey mate to produce a sterile mule (Hybrid sterility).
Individuals from two different species mate, but the resulting embryo dies before birth (Hybrid inviability).
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what are the resources for which weeds compete with turgrasses?
Answer:
Weeds and turfgrass struggle for water, nutrients, and light when they are left unchecked, but weeds win this conflict because they are more aggressive competitors than the majority of turfgrass species. Furthermore, the presence of weed species in turfgrasses lowers the utility, aesthetic value, and playing quality of the grass.
___________________
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if a tunicate's pharyngeal gill slits were suddenly blocked, the animal would have trouble _____.
If a tunicate's pharyngeal gill slits were suddenly blocked, the animal would have trouble respiring and feeding.
What are the tunicate's pharyngeal gill slits?The tunicate's pharyngeal gill slits are a series of structures within this taxonomic group that function in order to make the process of respiration and feeding possible by filtering substances in the aquatic environment.
Therefore, with this data, we can see that the tunicate's pharyngeal gill slits play a fundamental role in filtering substances.
Complete question:
Fill in the blank. If a tunicate's pharyngeal gill slits were suddenly blocked, the animal would have trouble___.
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lactic acid was generated by the leg muscles after a bunch of hard squats and is now circulating in the blood which of the following is likely to occur as a compensation of this lactic acid buildup
The following are likely to occur as a compensation of lactic acid buildup:
Decreased urinary pHIncreased H+ in bloodIncreased hyperventilationIncreased H+ selectionWhat is lactic acid?
Red blood cells and muscle cells are the principal producers of lactic acid. When oxygen levels are low, it develops when the body metabolizes carbohydrates for energy.
In the body, lactic acid serves three basic purposes:
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the term meaning blood within a joint is
The term meaning blood within a joint is Arthrodesis. It is the surgical immobilization of a joint by fusing bones.
Why surgical intervention is important?It is a very important surgical intervention which is usually used to treat fractures of the joints, arthritis and similar conditions including painful joints which affect joint mobility.
It has become an important alternative for patients living with arthritis. Arthrodesis is the surgical immobilization of a joint by fusing bones. It is a very important surgical intervention which is usually used to treat fractures of the joints, arthritis and similar conditions including painful joints which affect joint mobility.
Therefore, The term meaning blood within a joint is Arthrodesis. It is the surgical immobilization of a joint by fusing bones.
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use the following model of a eukaryotic transcript to answer the question. e1-4 refer to the exons, and i1-3 refer to the introns in the pre-mrna transcript. 5' utr e1 i1 e2 i2 e3 i3 e4 utr 3' suppose that exposure to a chemical mutagen results in a change in the sequence that alters the 5' end of intron 1 (i1). which of the following results might occur? question 6 options: premature transcriptional termination loss of e1 loss of the gene product inclusion of i1 in the mrna
The exposure to a chemical mutagen results in a change in the sequence that alters the 5' end of intron 1
5' UTR E1 E2 E3 E4 UTR 3'
inclusion of I1 in the mRNA
Asymmetric RNA Splicing The first genes with alternative RNA splicing were discovered in the 1970s.
When multiple combinations of exons are joined to make the mRNA, a procedure called alternative RNA splicing enables diverse protein products to be synthesized from a single gene. The frequency of various splicing alternatives is controlled by the cell as a way to regulate the production of different protein products in different cells or at different stages of development.
Alternative splicing can be haphazard, but more often it is controlled and acts as a mechanism of gene regulation. In eukaryotes, alternative splicing is widely recognized as a frequent process of gene control. One estimate place the proportion of human genes that are expressed as numerous proteins by alternative splicing at 70%.
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Label the structures found within a skeletal muscle. Muscle fiber Myofibril Sarcoplasmic reticulum Filaments Perimysium Sarcolemma Epimysium Endomysium Fascia Epimysium Endomysium Fascia Tendon Fascicle Reset
The structures found within a skeletal muscle.
muscle fiberPerimysiumactinTropomyosinTroponinmyosinWhat is skeletal muscle?Skeletal striated muscle tissue is formed by bundles of very long, multinucleated cylindrical fibers known as skeletal striated muscle fibers. These bundles are surrounded by the epimysium, an outer membrane of dense connective tissue. Septa of very thin connective tissue, called perimysium, depart from these membranes, through which blood vessels enter the muscles. They are muscles of voluntary movement.
Myosin is made up of two subunits, light meromyosin and heavy meromyosin. The light meromyosin corresponds to the largest portion of the rod, while the heavy meromyosin is composed of the smallest part of the rod next to the globular projection.
The sarcolemma consists of a cell membrane, called the plasma membrane, and a lining of a thin layer of polysaccharide material, with many thin collagen fibrils.
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What would happen to a cell that didn’t replicate its dna before cell division?
The cell will not proceed with the further processes.
What is equational division?
Chromosome replication and equal distribution between the two daughter cells occur during the cell division process known as mitosis. Each daughter cell has the same number of chromosomes as the parent cell, making them diploid. Thus, mitosis is also referred to as equational division.
Unequal division will result if the cell didn't replicate prior to actually cell division. As a result of the checkpoints, it won't move on to the next step. The checkpoint will later start the apoptosis process, which results in programmed cell death.
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Assuming ri, r2 are negative constants and that $1,2, and $2,1 are positive constants, what do the following equations represent? 1 dN1 = ri + $1,2N2 Ni dt 1 dN2 = r2 + 82,1N1 N2 dt a. Competition b. Predation c. Facultative mutualism d. Obligate mutualisme.
Assuming a, r2 are negative constants and that $1,2, and $2,1 are superb constants choice D obligates mutualism.
D. Obligate mutualisme.
crosses x-axis --> 1 species relies upon on the alternative/ negative population increase at some unspecified time in the future.
The negative constant time period is n. If n is wonderful, the graph of a line with slope m intersects the y-axis above the starting place at (0, n) If n is bad, the graph of a line with slope m intersects the y-axis under the foundation, at (0, n). The phrase "tremendous linear feature" isn't used.
The regular can be high quality or negative. If for a few purposes we already know it is able to simplest have values such as 1 and –1, we may say it equals ±1. Mathematical symbols are used mostly for comfort they do not make anything greater correct.
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The following F1 cross is made: BBGg x Bbgg. Which is not a possible outcome in the F2 generation?
`When the cross of BBGg x Bbgg is made then in this situation the gametes that are formed from BBGg are BG,Bg and from Bbgg is Bg,bg are BBGg,BBgg,BbGg and Bbgg. The four outcomes are BBGg,BBgg,BbGg and Bbgg and the homozygously dominant and the recessive is absent.
What is homozygous ?It is the situation in which the same types of gametes are present.
In the cross of BBGg x Bbgg the gametes that are absent will be the homozygous dominant condition and the homozygous recessive as well. BBGg,BBgg,BbGg and Bbgg are the gametes that are all heteroygous.
Heterozygous condition is the condition in which different gametes are present that is different different situation is present and the gametes in the offspring are totally different.
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Which of the following is NOT a result of increased ATP in the pancreatic beta cell?
Group of answer choices
insulin release
vesicle fusion
potassium release
calcium intake
Vesicle fusion is NOT a result of increased ATP in the pancreatic beta cell.
What is ATP?
Cells consume and store energy from adenosine triphosphate (ATP), which is the energy source. An adenine-based nitrogenous base, ribose sugar, and three serially bound phosphate groups make up the nucleoside triphosphate structure of ATP.
When macromolecules like proteins and lipids are moved into and out of the cell, ATP is an essential component of the process. Active transport mechanisms that move these molecules over a concentration gradient are powered by the energy released during ATP hydrolysis.
Therefore, Vesicle fusion is NOT a result of increased ATP in the pancreatic beta cell.
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electrons excited in photosystem ii help the chloroplast produce
As excited electrons move through the electron transport chain, NADPH is created.
The photosystem II's source of the excited electrons is what?A chlorophyll molecule's excited electron is moved to the an electron acceptor at the reaction center.It's an oxidation-reduction reaction right now.An electron from water is used in photosystem II to replace the electron lost from the reaction center.
What is produced during photosynthesis by photosystem 2?In oxygenic photosynthetic organisms, photosystem II is the first membrane protein complex.It uses light energy to catalyze the oxidation of water, which results in the production of atmospheric oxygen.
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The capillaries that nourish the epithelium and absorb digested nutrients lie in the ________.
A. Muscularis mucosae
B. Serosa
C. Adventitia
D. Lamina propria
The capillaries that nourish the epithelium and absorb digested nutrients lie in the Lamina propria (Option D).
What are the capillary blood vessels?The capillaries are small vessels capable of transporting oxygen and nutrients to all cells of the body in order to perform cellular respiration, which is fundamental to obtaining energy in the form of ATP.
Therefore, with this data, we can see that the small capillary blood vessels that lie in the lamina propria and other tissues in the body are required to transport both oxygen and nutrients.
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which of the following tactile receptors is found in the dermal papillae? identification of tactile receptors which of the following tactile receptors is found in the dermal papillae? identification of tactile receptors tactile disc ruffini corpuscle free nerve endings tactile corpuscle
Meissner corpuscle or tactile corpuscle is the tactile receptor found in the dermal papillae.
Professor Georg Meissner and Professor Rudolf Wagner initially identified Meissner corpuscles, often referred to as Wagner-Meissner corpuscles or tactile corpuscles, as a subset of mechanoreceptors in 1852. These unique encapsulated nerve terminals transmit low-frequency vibration and fine touch sensations to the central nervous system from the dermal papillae of glabrous skin (CNS). Meissner corpuscles are crucial for somatosensory acuity, particularly in the palmar skin and digital extremities. This has clinical implications for diabetic neuropathy, peripheral neuropathy, and the aging-related deterioration of dermatological tactile sense.
Meissner corpuscles are ellipsoid mechanoreceptors that are situated 150 micrometres superficially within the dermal papillae. The corpuscles have a long axis that is perpendicular to the skin's surface and are between 20 and 40 micrometres in diameter and 80 and 150 micrometres in length. Less than three corpuscles per papilla, with one corpuscle every two to four dermal papillae. The site of genesis affects the receptors' size and density.
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Answer and match them
Answer:
Answered (?)
Explanation:
1. C
2. E (?)
3. F
4. D
5. B
6. A
I wasn't sure about E because for me I would say that means 'extinction' but that's not an answer, I tried my best and hope this helps!
Which of the following processes correctly describes alternative RNA spiling?
O It can allow the production of similar proteins from different RNAS.
O lt is a mechanism for increasing the rate of transation.
O It increases the rate of transcription.
O It can allow the production of protens of different sizes and functions strom a single mPRA
Answer: d
Explanation:
Which of the following statements about meiosis and mitosis is true?
a) In meiosis II and mitosis, a diploid cell divides.
b) Meiosis II is similar to mitosis in that sister chromatids of each chromosome separate.
c) In mitosis and meiosis I, homologous chromosomes move independently of each other.
d) Each daughter cell produced during meiosis and mitosis is genetically identical to the parent cell.
Sister chromatids of each chromosome separate during meiosis II, which is identical to mitosis in this regard.
The ideal answer is B.
Which of the following statements concerning meiosis and mitosis is true?What is the correct way to describe meiosis and mitosis? While the byproducts of mitosis are all the same, those of meiosis can vary from one another (except for rare mutations).
How do meiosis and mitosis differ from one another?Meiosis creates cells that are genetically distinct from the parent and have half the amount of DNA as mitosis, which creates two genetically identical "daughter" cells from a single "parent" cell. The majority of cells in the body constantly undergo mitosis, while some do it more frequently than others.
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What is sea farming?
Answer: Aquaculture (sea farming) is the cultivation of aquatic animals and plants in controlled environments.
Explanation:
Seawater farming addresses the severe lack of freshwater and undesirable soil conditions for agricultural activities in coastal regions. Saltwater, instead of freshwater, can be used to directly support a wide range of sustainable agricultural activities and enrich the soils in the coastal regions.
Answer: um well its kinda like ----- when animals and plants are controlled environments of farming seaweed and shellfish well it's like water based farming
Explanation: hope it helps
the theory of endosymbiosis and history of life on earth allows one to predict that the gene sequences that are responsible for encoding functional, mitochondrial ribosomes in a particular tree likely share many similar nucleotides in the sequences from the ribosomal genes of other plant species bacterial species other tree species
The theory of endosymbiosis and the history of life on earth allows one to predict that the gene sequences that are responsible for encoding functional, mitochondrial ribosomes in a particular tree likely share many similar nucleotides in the sequences from the ribosomal genes of other bacterial species (Option II).
What is the theory of endosymbiosis?The theory of endosymbiosis is a model to explain the origin of eukaryotic cells, which postulates that these types of organisms evolved as a consequence of symbiotic relationships between primitive bacterial cells that converted into mitochondria and chloroplasts in animals and plants.
Therefore, with this data, we can see that the theory of endosymbiosis is based on the scientific idea that eukaryotic cells as observed in plants and animals generated due to symbiosis with primitive bacterial cells that entered into the cell and performed cellular respiration and photosynthesis.
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in a study of the forces involved when motor proteins
Motor proteins also produce force locally within the network of cytoskeletal polymers, which transmits these forces to determine the shape of each cell and, ultimately, the architecture of tissues and whole organisms. Chapters 37 to 39 and 44 illustrate how motors move cells and their parts.
structural damage from tornadoes is usually caused by
High winds are frequently to blame for tornado-related structural damage.
Why do tornadoes form?Thunderclouds contain warm, humid air that rises as chilly air that is accompanied by rain or hail descends.These circumstances might result in the formation of whirling air currents inside the cloud. Although the whirling currents begin horizontally, they have the ability to turn vertical, drop from the cloud, and eventually form a tornado..
What three types of tornadoes are there?Examples of various tornado types include the multiple vortex tornado, landspout, and waterspout.A waterspout is caused by a massive cumulus or cumulonimbus cloud coupled to a spiraling funnel-shaped.
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arginase, a key enzyme in liver urea production, requires four ____ atoms per molecule. group of answer choices iron copper zinc manganese
Ceruloplasmin is one illustration; it has eight copper atoms per molecule. Copper and zinc provide as examples of the needs for and toxicity of important trace elements.
What trace mineral is necessary for gluconeogenesis' primary enzyme to be activated?Manganese is a trace mineral that functions as a cofactor for enzymes that produce urea, cholesterol, and glucose (gluconeogenesis) (amino-acid catabolism in the liver).
Which Micromineral is deemed crucial for healthy brain function?The liver, kidney, pancreas, and bones are where manganese is primarily deposited. and contributes to the regulation of blood sugar, calcium absorption, and fat and carbohydrate metabolism. For healthy nerve and brain function, manganese is also essential.
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