Which component of the PCR mix do researchers manipulate to induce a site-specific mutation?
A. Reverse transcriptase
B. Primers
C. DNA template
D. Taq polymerase
Answer: B
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What happens to CDK in the absence of cyclin?
A. It is inactive. B. It is degraded. C. It becomes phosphorylated. D. Answers a and c are both correct.
When performing 2-D gel electrophoresis, what is the purpose of exposing the proteins to sodium dodecyl sulfate (SDS)?
A. SDS masks all of the proteins' native charge with a positive charge. B. SDS masks all of the proteins' native charge with a negative charge. C. SDS makes all of the proteins' the same molecular weight. D. SDS adds a hydroxyl group to amino acid residues on each of the proteins. E. SDS masks all of the proteins' native charge with a neutral charge.
Rank the sensory receptors in order, from the ability to detect the widest variety of molecules, to the least variety of molecules (or none).
__ photoreceptors __ TRP channel temperature receptors __ gustatory receptors __ olfactory receptors Clarify Question What is the key concept addressed by the question? What type of thinking is required? Gather Content What do you already know about sensory receptors? What other information is related to the question? Choose Answer Given what you now know, what information 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?
Some secondary metabolites are bitter or toxic. What protective effect does this have for plants?
a. protection from overexposure to UV radiation b. defense against pathogens c. long distance signaling response d. defense against herbivores