Explain what might occur when purine or pyrimidine bases in nucleotides undergo tautomeric shifts
What will be an ideal response?
Tautomeric shifts, small atomic changes within purine or pyrimidine base molecules, change the hydrogen bonding properties of bases and allow bonding with noncomplementary bases that can lead to permanent base changes in sequence following replication. Many DNA mutations that begin as tautomeric shifts can also be induced by external agents.
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Imagine two species of birds with similar beak sizes and diets. Where the two species are allopatric, we would expect that their beak sizes
A. should be more different than when sympatric. B. should be more similar than when sympatric. C. should be larger than when sympatric. D. should be smaller than when sympatric. 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 character displacement? 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?
There are no infectious agents that can penetrate intact skin.
Answer the following statement true (T) or false (F)
Living organisms are distinct from nonliving
things by which of the following features?
a. continuous energy inputs b. complex molecular structure c. DNA that guides functioning d. sensing and responding to change e. all of these except complex molecular structure
In invertebrates with open circulatory systems, hemolymph is composed of:
A. interstitial fluid. B. plasma plus interstitial fluid. C. plasma plus intracellular fluid. D. plasma.