Answer:
this is true it neutralise easily
It is true that in the DNA isolation process, cells are mixed with sodium chloride (i.e. NaCl) because the sodium (Na ) neutralizes the negative charge of DNA.
What is DNA isolation?DNA extraction is a method of separating DNA from cell membranes, proteins, and other cellular components using physical and/or chemical methods from a sample. In 1869, Friedrich Miescher isolated DNA for the first time.
The ability to extract DNA is critical for studying the genetic causes of disease and developing diagnostics and drugs.
It is also required for forensic science, genome sequencing, detecting bacteria and viruses in the environment, and determining paternity.
Because sodium (Na+) neutralizes the negative charge of DNA, cells are mixed with sodium chloride (i.e. NaCl) during the DNA isolation process. It makes homogenization easier.
Thus, the given statement is true.
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Knowledge of the driver mutations underlying cancer has led to targeted therapeutics, such as the protein kinase inhibitor imatinib (trade name Gleevec) in cases of chronic myeloid leukemia. Cancer cells often become resistant to a given drug, so researchers continue searching for new drugs that target proteins that contribute to the cancerous phenotype. One recent promising approach uses drugs that lead to ubiquitination and proteasomal degradation of the target protein. Which of the following mutated proteins are good candidates for this approach?
A) oncogenes
B) proteins with loss-of-function mutations
C) proteins with gain-of-function mutations
D) tumor suppressor genes
Answer:
C) proteins with gain-of-function mutations
Explanation:
Gain-of-function mutations: In biology, the term "gain-of-function mutation" is described as one of the different types of mutation in which the altered or changed "gene product" consists of an entirely new pattern or molecular function associated with gene expression. However, the "gene-of-function mutations" are being always considered as "Semidominant or Dominant".
In the question above, the correct answer is option C.
Centrioles have pulled the chromosomes all the way to the spindle poles, the process of cleavage furrowing appears to be about to begin. What kind of a cell is this?
Answer:
An animal cell in the telophase
Explanation:
Telophase is one of the stages of cell division in animal cell .
In the animal cell during telophase, Centrioles have pulled the chromosomes all the way to the spindle poles, the process of cleavage furrowing appears to be about to begin because the nuclear membrane and nucleoli reform, cytokinesis is almost coming to completion and the chromosomes eventually uncoil to chromatin. Usually cytokinesis occurs during telophase.
I was finishing Summer B Plato Biology for High School when the program closed. All I had left to finish was my final. Does anyone have sample questions of the final I can study? I am bummed!
Two of the many cycles in nature's web of life are the carbon cycle and the A. energy cycle B. water cycle C. food cycle D. heat cycle
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▹ Answer
B. water cycle
▹ Step-by-Step Explanation
Water is something that is dependent on amongst living things. Without the water cycle, there wouldn't be a source of water and living things wouldn't be able to survive.
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DNA and RNA are structurally similar in some ways, but different in others. Identify whether each of the following statements applies to DNA, RNA. both or neither.
1. It can contain the purine adenine.
2. It can contain the pyrimidine uracil.
3. This contains the pyrimidine thymine.
4. In terms of base composition, the %T = %G.
5. This contains the sugar ribose.
6. The sugars are connected with a 3'-5' phosphodiester link.
7. It contains equal amounts of guanine and cytosine.
8. Bases are attached to sugars in an alpha N-glycosides linkage.
Answer:
DNA
It can contain the purine adenine
This contains the pyrimidine thymine
The sugars are connected with a 3'-5' phosphodiester link.
It contains equal amounts of guanine and cytosine. The percentage of A-T ,C-G are the same in DNA,,they are linked by hydrogen bonds.But varies in RNA.
Explanation:
.RNA
It can contain the purine adenine.
It can contain the pyrimidine uracil
This contains the sugar ribose. This is a 5C sugar with one oxygen atom deficient.The forms the lever for holding the bases and phosphate group
The sugars are connected with a 3'-5' phosphodiester link.This is the backbone of both DNA and RNA.It is formed between the sugars and the phosphate groups in both DNA and RNA.
None is made of base composition, the %T = %G. This is wrong because purines must pair with pyrimidine,but not two purines or pyrimidine pairing as shown,
Bases are attached to sugars in an alpha N-glycosides linkage.This is wrong the beta N-glycisidic bonds are the linkages
A layer of cells called the endodermis surrounds the stele. Xylem is found towards the center of the stele and phloem towards the outside of the stele. 18) How does this compare to their arrangement in the stem? 19) The meristematic region is protected in the root by the presence of a root cap. How is the meristematic region protected in the stem tip? 20) In which of these regions would you expect to find the specialized cells of vascular tissue? 21) In which of these regions are the cells genetically identical? 22) Why?
Answer:
Epidermis layer is responsible for the protection of meristematic region.
Explanation:
Meristematic region is protected in the stem tip by epidermis which consist of dead layer of cells. Epidermis is the outer layer of stems, leaves, flowers and fruits which is responsible for the protection of inner part from damage. Vascular bundle such as phloem present near the boundary of the stem while the xylem is present in the inside of the stem. In the inside layer of the stem, all the xylem cells are genetically identical while the layer that is present at the edge of the stem is phloem in which all the cells are genetically identical to each other.
Assume that the allele for curly tail is completely dominant to the allele for straight tail for an X-linked maternal effect gene. Which of the following can be true?
a. In order for a female to be curly tailed, her father must be curly tailed.
b. A straight tailed male must have a straight tailed mother
c. mother with a straight tail cannot have progeny with curly tails
d. A male with a curly tail received a straight tail allele from his mother.
Answer:
A
Explanation:
In order for a female to be curly tailed, her father must be curly tailed.
What is a peer review? Why is it important?
Answer:
Peer review involves subjecting the author's scholarly work and research to the scrutiny of other experts in the same field to check its validity and evaluate its suitability for publication. A peer review helps the publisher decide whether a work should be accepted.
A mutation causes a sequence of DNA that has the nucleotides TTG to be changed to TCG. The resulting protein has a different sequence of amino acids. Which type of mutation is this? a. missense b. nonsense c. silent d. frameshift
Answer:
The correct answer would be - a) missense.
Explanation:
A missense mutation is a type of a point mutation that is caused by the alteration or change in the a nucleotide of a triplet codon in a DNA sequence. This leads to a altered mRNA and incorporate different amino acid and ultimately different protein than usual.
This type of mutation can produce non functional protein by translation in most of the case and did not make any big change in the individual.
Thus, the correct answer would be - a) missense.
Answer:
A. Missense
Explanation:
edge 2020 100%
Lactose (milk sugar) is a carbohydrate that is formed by combining galactose and glucose. Which term best describes this molecule?
Answer:
disaccharide
Explanation:
A disaccharide is a form of sugar that is made up of the combination of two other sugar molecules that are simple. They possess the property to dissolve easily in water. The process that occurs to join the two simple sugars includes the removal of water from the molecules. Sucrose, lactose, and maltose are the three disaccharides.
Answer:
disaccharide
Explanation:
A disaccharide is a form of sugar that is made up of the combination of two other sugar molecules that are simple. They possess the property to dissolve easily in water. The process that occurs to join the two simple sugars includes the removal of water from the molecules. Sucrose, lactose, and maltose are the three disaccharides.
Fermentation converts organic material into a fuel whose primary component is
A. methane
B. sugar
C. yeast
D. alcohol
Answer:
D. alcohol
Explanation:
Fermentation by microorganisms converts organic materials into alcohol
g why did you digest the plasmid with XhoI? What is your expectation if the plasmid is a closed vector without an insert? What is your expectation if your plasmid has an insert (how many bands, what are their sizes)?
Answer:
I digest the plasmid with Xholin so as to find out the total size of the plasmid after insertion of the gene of interest and whether or not the insert went into the vector. Ao the plasmid is a reclosed vector without an put we expect to see one band. However, if the plasmid has an insert, we expect to see two bands on the gel
Scientists today are studying tidal power as an alternative energy source for generating electricity. Some scientists conclude that tidal power is a good alternative source of energy because it uses a natural process, does not rely on fossil fuels, and does not release greenhouse gases. These scientists recommend building tidal power plants around the United States in locations with high tidal power potential. Other scientists conclude that tidal power is not a good alternative energy source because tidal power plants can negatively impact the surrounding ecosystem by killing marine animals, restricting fish migration, reducing the natural flow of water, and causing silt buildup in waterways. These scientists recommend not building tidal power plants in U.S. waterways. Both conclusions are based on valid data and scientific reasoning. How can both conclusions be valid?
Answer:
See the answer below
Explanation:
Both conclusions can be valid because they are based on valid data and scientific reasoning.
In order for a data to be valid in making a conclusion, such data must have been collected through a scientific experiment that is devoid of subjectivism. In order words, the data must have been objectively collected via standard experimental procedures.
Once data have been collected, they are analyzed and used to make valid conclusions based on the hypothesis which must have been made earlier before the experiment.
Conclusions made from standard experimental procedures and scientific reasonings are valid and such experiments are reproducible.
Hence, as long as the data from which the conclusions were made can be reproduced through the same experiments, the conclusions are valid.
Which is biotic?
O water
O temperature
beeswax
rocks
Beeswax because it is a livong thing
The biotic factor among the options given is beeswax, which is the third option, as the biotic factors are living or once-living organisms in an ecosystem that directly or indirectly affect other organisms.
What is a "biotic factor"?Biotic factors are living or once-living components of an ecosystem that have a direct or indirect effect on the survival, growth, and reproduction of other living organisms. Examples of biotic factors include plants, animals, fungi, bacteria, and other microorganisms that are part of the ecosystem. Beeswax, as mentioned, is a biotic factor because it is produced by living organisms, specifically bees. Beeswax is used by bees to build their hives or nests, which are important structures for their survival and reproduction.
Hence, the biotic factor among the options given is beeswax, which is the third option.
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A mangrove swamp is more likely to exist along shores of which location?
Do the spinal nerves include the sensory or motor neurons? Where do these neurons enter or exit the spinal cord?
Answer:
hd
Explanation:
The spinal nerves include the sensory or motor neurons sensory neuron → brain → motor neuron → muscles.
What are neurons?Neurons are nerve cells that are specialized to process and transmit information. The brain then processes the information obtained from the sensory neuron and sends another signal trough the motor neuron carrying the message to the muscle.
The spinal cord acts as a nerve center between the brain and the rest of our body and it contains motor neurons that transmits nerve signals from the motor cortex to the body, and the spinal cord also receives all of the sensory information from the periphery of our bodies.
Motor neurons are also known as efferent neurons, they are part of the central nervous system that transmit impulses from the brain or spinal cord to the effector organ (muscles or glands).
Therefore, The spinal nerves include the sensory or motor neurons sensory neuron → brain → motor neuron → muscles.
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The pygmy shrew is the smallest mammal in North America. However, when comparing the amount of
food eaten to its body weight, the pygmy shrew eats more food than any other mammal. It will
consume two to three times its own body weight in food daily. One explanation is that the pygmy
shrew uses energy at a high rate. In fact, its heart beats over one thousand times per minute.
What is the best explanation for what happens to the food's mass and energy when it is consumed by
the pygmy shrew?
A. The mass is mostly excreted as waste. The
energy is burned up and destroyed by the
pygmy shrew's high rate of cellular respiration.
B. The mass is all used for creating new mass in
growth. The energy is stored, used in cellular
respiration, or lost to the environment as heat.
C. The mass is used for growth, stored, or excreted
as waste. The energy is stored, used in cellular
respiration, and lost to the environment as heat.
D. The mass is used for growth, stored, or excreted
as waste. The energy is burned up and
destroyed by the shrew's high rate of cellular
respiration
Answer:
C. The mass is used for growth, stored, or excreted
as waste. The energy is stored, used in cellular
respiration, and lost to the environment as heat.
Explanation:
I got it right on the quiz.
Mass used for growth, stored or excreted as waste. Energy is stored that is used in cellular respiration which is lost to the environment in the form of heat. So, the correct option is (C).
How Pygmy shrew uses its food for energy?The pygmy shrew has a large appetite which is a result of small body mass, rapid heat loss and high metabolic rate. It is kept in captivity which provides some idea of the energy requirements of the species.
The pygmy shrew has such a high metabolism that it must eat at least every 30 minutes otherwise it will die. This can be explained by food mass and energy is that due to very high metabolism most of the food mass which is rapidly used up to form shrew, and a large proportion of the food is lost from the body surface because of its very small size.
The combination of these two factors are
1. A very high metabolism which is rapidly utilizes food material, and generates large amounts of heat in a very short period of time.
2. Very small size due to which high surface area to volume ratio leading to heat loss.
Thus, Mass used for growth, stored or excreted as waste. Energy is stored that is used in cellular respiration which is lost to the environment in the form of heat. So, the correct option is (C).
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You cross a plant with red flowers with a plant with white flowers. Both plants are pure-breeding. All the offspring have pink flowers. What allele relationship does this display? codominance multiple alleles incomplete dominance pleiotropy
C. Incomplete dominance.
Explanation:
Incomplete dominance is the blending of alleles. If a plant with red flowers and a plant with white flowers produce offspring, then the flowers will be pink. Red and white mixed together will be pink, the alleles blended.
Codominance is where both traits are present, no blending occurs. If a plant with red flowers and a plant with white flowers produce offspring, the flowers will be both white and red. The flower may be white with red spots, or vice versa. Both alleles are present in the flower.
In this case, it is incomplete dominance, as the offspring is a mix of the parents. The alleles blend and the offspring is pink.
Answer:
incomplete dominance
Explanation:
gradpoint
Cloning to produce embryonic stem cells is called A) regenerative cloning. B) transplantational cloning. C) reproductive cloning. D) therapeutic cloning. E) dedifferentiation.
Answer:
D
Explanation:
The correct option would be therapeutic cloning.
First and foremost, cloning refers to the process of producing genetically and phenotypically similar organisms or cells from a single organism/cell, be it naturally or artificially. The genotypically and phenotypically similar copies of the original organism are called clones.
Artificial clonings are of different types, namely:
Reproductive cloningGene cloningTherapeutic cloningReproductive cloning has to do with producing genetically identical organisms from a particular organism while gene cloning involves producing exact copies of a gene or segments of DNA. Therapeutic cloning, however, involves the production of embryonic stem cells in order to create tissues that would replace similar but damaged or worn-out tissues in living organisms.
Correct option: D
For lions how can we determine who the father is
Aquatic organisms in coastal areas face a variety of predators on land and in the water and air. Which ocean process exposes the coastal aquatic organisms to land-based predators? a. Changing wind patterns alter the ocean currents, changing tide levels. b. Daily tidal patterns leave areas exposed to the land for part of the day. c. The constant wave action generates nutrients that attract predators. d. The ocean conveyor belt raises and lowers the water levels on the coasts.
Answer:
b
Explanation:
The correct answer as to the ocean process that exposes the coastal organisms to land-based predators would be the daily tidal patterns that leave the coastal area exposed to the land for a part of the day.
Some parts of the coastal areas become exposed to land during certain periods of the day as a result of tidal waves. When this happens, the aquatic organisms occupying these coastal areas become temporarily exposed to land predators who hunt and kill them for food.
Therefore, the correct option is b.
Which of the following statements is compatible with Darwin’s theory of evolution? much of the variation in individuals of a population is heritable resources are unlimited survival depends mostly on luck members of a population are usually very much alike in their characteristics
Answer:
A. much of the variation in individuals of a population is heritable
Explanation:
Charles Darwin is a scientist well known for his development of the concept of evolution. Darwin was able to deduce that the species of a population have a common ancestor and that as time passes there is a modification in the characteristics of these species that makes it easier for them to adapt to their environments. These traits that were inherited from past descendants, were helpful traits that made it possible for their own descendants to be able to survive better than their peers. He noted that there were limited resources for survival, therefore it was a case of the survival of the fittest.
Natural selection was the term used by him to describe how species of a population survived over time. Members of a population had varied traits that enabled them to survive. For example, the descendants of an ancestor could have slightly different shapes, colors, sizes, and other features but still maintain traceable heritable traits.
How do animals survive along the deeper parts of the seafloor? A They feed at the surface. B They feed on each other. C They photosynthesize.
Answer:
They photosynthesize..
Explanation:
There are several ways deep ocean animals survive in such an enviournment..Food is scare in much of the deep sea, in parts because photosynthesis only thakes place at the ocean's surface where there's sunlight. Most animals cope with this by begin very small and meeding less to eat of by growoing very slow..
Answer:
the answer is They photosynthesize..
Explanation:
Climate change and succession both result in a change to the ocean ecosystem. What is succession?
a. Succession is a gradual change to ocean temperatures.
b. Succession is a gradual change to ocean communities.
c. Succession is a rapid change in ocean temperatures.
f
d. Succession is a rapid change to ocean communities.
Answer:
b. Succession is a gradual change to ocean communities
Explanation:
An ecosystem can undergo changes in it's structure and composition over a particular period of time. This term is called ECOLOGICAL SUCCESSION. Succession is the gradual change that occurs to a community over time. Succession is of two types; primary and secondary succession.
According to the question, climate change and succession are causes of change to the ocean ecosystem. Hence, succession there represents the gradual change that occurs to the structural composition of ocean ecosystem over time.
Answer:
The answer is B - Succession is a gradual change to ocean communities
Explanation:
Think of primary and secondary succession, these processes take time.
The basal side of epithelium is always connected to?
A) basement membranes
B) connective tissue
C) epithelial cells
D) blood vessels
Answer:
Basement membranes
Explanation:
In most organisms, the end product of glycolysis is pyruvate. Pyruvate still contains a substantial amount of energy, which can be further extracted. Whether the organisms are operating under aerobic or anaerobic conditions determines the metabolic pathway that pyruvate undergoes to produce more ATP. In this tutorial, you will identify the end products of these metabolic pathways.
Answer:
Pyruvate helps in the production of ATP.
Explanation:
The molecule of pyruvate converted into acetyl CoA. Then each molecule which is produced during glycolysis loses electron and carbondioxide releases. After the breakdown of pyruvate, the electrons loses by pyruvate are transferred to NAD+ in order to produce NADH, which will be used by the cell to produce energy molecule such as ATP. So we can say that pyruvate plays a vital role in the formation of ATP molecule.
Which of the following pairs of plants are rhizomes?
A. Cocoyam and Cassava
B. Canna lily and ginger
C. Onion and Garlic
D. Banana and plantain
Answer:
B.
Explanation:
Examples of plants that are propagated this way include hops, asparagus, ginger, irises, lily of the valley, cannas, and sympodial orchids. Some rhizomes that are used directly in cooking include ginger, turmeric, galangal, fingerroot, and lotus.
Prader-Willi syndrome is a genetic disorder involving a partial deletion of chromosome 15q on the paternal chromosome. When both copies of a gene (or chromosome) are functional but only one is expressed, this is an example of ________.
Answer:
monoallelic gene expression
Explanation:
Monoallelic expression is a type of gene expression where only a copy out of the two copies of a gene is expressed and the other is silent.
A gene is usually represented by two alleles representing alternate forms of the same character. Individuals inherit an allele each from their two parents for every gene within their genomes.
When only one of the alleles is expressed for a particular gene while the other allele remains silent, such phenomenon is referred to as monoallelic gene expression.
____________ a regulatory protein that may bind DNA to inhibit transcription. ____________ a DNA sequence that binds a regulatory protein. ____________a DNA sequence that binds RNA polymerase and regulates transcription. ____________a compound that interacts with another protein or compound to form an active repressor ____________a compound that induces or activates transcription, such as lactose.a. Repressorb. Operator c. Promoterd. Corepressore. Inducer
Answer:
A repressor is a regulatory protein that may bind DNA to inhibit transcription. An operator is a DNA sequence that binds a regulatory protein. A promoter is a DNA sequence that binds RNA polymerase and regulates transcription. A corepressor is a compound that interacts with another protein or compound to form an active repressor. An inducer is a compound that induces or activates transcription, such as lactose.
Explanation:
Repressor proteins bind to DNA and RNA to suppress target gene expression. A DNA repressor blocks transcription by inhibiting the attachment of RNA polymerase to the promoter sequence, while an RNA repressor bind to the mRNA to block translation of the protein. An operator is a DNA sequence required for the attachment of transcription factors. The genes that are transcribed by the binding of a transcription factor to an operator sequence are collectively referred to as an operon. Operons are generally found in prokaryotes but they also can be found in some eukaryotes including Caenorhabditis elegans and Drosophila melanogaster. An inducer is a molecule that activates gene transcription either by binding to repressors/corepressors (thereby inactivating their functions) or by binding activators. For example, the allolactose act as an inducer of the lac operon.
Mechanical energy is the sum of energy and energy in a system
Answer:
kinetic and potential energy
Answer: Hey There,
Explanation: In physical energy is the sum of potential energy and kinetic energy.
Examples for mechanical energy are:
hammerdart gunwind millbowling ballhydropower plantcyclingmoonThe seven forms of energy:
meachanical,heat chemical, electrical radiant , nuclear and sound.
OKAY, I HOPE IT HELPS YOU TO UNDERSTAND
