a. A
b. B
c. C
d. D
Answer the question using the accompanying figure. In the box labeled ‘A’, ____ levels ____.
a. insulin; decrease
b. insulin; increase
c. glucagon; decrease
d. glucagon; increase
e. glycogen; decrease
ANSWER: c
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Phycobilins are
(a) photosynthetic pigments. (b) found in the red algae. (c) blue and red pigments. (d) all of the above.
A population of mountain goats are split because of the formation of a glacier. After 500 years the glacier melts and the two goat populations are free to move between the two areas. Under what conditions might a hybrid zone occur?
A. Both pre-¬ and post-¬zygotic isolating mechanisms have arisen. B. Reproductive isolation is incomplete. C. Pre-¬zygotic isolating mechanisms have arisen. D. Post-¬zygotic isolating mechanisms have arisen. E. Gene flow between the two populations does not occur.
Differences between the amino acid sequence of human cytochrome c and that of 5 other species are given in the choices below. Based on these data, humans are most closely related to
A) bullfrogs: 20 amino acid differences. B) pigeons: 12 amino acid differences. C) fruit flies: 24 amino acid differences. D) yeast: 42 amino acid differences.
Sodium-potassium pumping moves ____ potassium ions into the cell for every ____ sodium ions that move out of the cell
a. two; two b. three; two c. two; three d. three; three e. three; four