How many layers of cells are found in the retina?
A. one
B. two
C. three
D. four
Answer: C
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Hibernating male ground squirrels emerge from their burrows before the females do, and before food is available. What important point does this fact demonstrate? a. Timing mechanisms are inaccurate, especially for males. b. Timing mechanisms prepare animals for future needs. c. Timing mechanisms are gradually evolving
d. Timing mechanisms operate on a circadian basis.
How many ova are human females usually born with?
A. 100,000 B. 400,000 C. 500,000 D. 1,000,000
Activation of _______ is the mechanism of programmed cell death, or apoptosis.
A. caspases B. neurotrophins C. sonic hedgehog D. inducing proteins
According to current research, what percentage of emerging adult women have had sexual relations against their will?
a. 10% b. 15% c. 25% d. 55%