2-amino-purine is a mutagenic chemical whose structure closely resembles that of adenine. It would
therefore be
A. a base analog that causes substitution mutations.
B. a base analog that causes frameshift mutations.
C. an intercalating agent that causes substitution mutations.
D. an intercalating agent that causes frameshift mutations.
E. It could act in any of these ways.
A
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Why are vasodilation and vasoconstriction the main mechanisms to change blood flow?
A. Blood vessel length is relatively fixed and has no effect on blood flow. B. Blood hematocrit has no effect on blood flow. C. Leakage of fluids from the capillaries has no effect on blood flow. D. Sympathetic activation has no effect on blood flow.
Which physiological process allows many organisms to maintain relatively constant conditions within their cells and
tissues?
a. torpor b. homeostatic responses c. facultative responses d. behavioral adaptations e. photosynthesis
Sharks differ from most other fishes in that they lack ____
a. lungs b. scales c. bony skeletons d. paired appendages e. jaws
If two organisms are members of the same phylum, then they must also be members of the same
A) domain. B) family. C) class. D) genus. E) species.