All of the following are examples of epigenetic changes except
A. microbial mucinase digests the protective lining of mucous membranes.
B. microbe binds to small RNAs disrupting gene regulation.
C. host cell genome is altered, interrupting transcription.
D. histones are altered, which affects replication and transcription.
Answer: A
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Your research project involves the characterization of a recently identified transcription factor. As part of your project, you want to determine if this transcription factor binds directly to any of the general transcription factors. Unfortunately, you are having trouble expressing the full-length protein. What approach may help achieve your research goal?
A. You must find a way to express the full-length protein, since transcription factor functions do not lie in separate domains. B. Identify the RNA that mediates the protein-protein binding. C. Express and purify only the DNA-binding domain, and test for binding. D. Express and purify only the activation domain, and test for binding. Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? · What key words does the question contain and what do they mean? Gather Content · What do you already know about specific transcription factors? Consider Possibilities · What other information is related to the question? Which information is most useful? · Consider the different answer options. Which can you rule out? Choose Answer · Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer? Reflect on Process · Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
Once glucose has entered a cell, what prevents
it from diffusing back out of the cell?
a. glucose pumps actively pump it back b. one side of the cell membrane is permeable to glucose, but the other side is not c. glucose inhibitors attach to glucose once it’s in the cell d. glucose is phosphorylated preventing it from leaving the cell e. glucose is hydrolyzed into two three-carbon molecules that cannot diffuse in a reverse direction
The jawed fish and all other vertebrates are gnathostomes, which means they have
A. a notochord that develops into a vertebral column. B. segmentation. C. amniotic eggs. D. exoskeletons E. jaws.
Evolution is a process which is moving towards a defined goal.
a. true b. false