Sperm pass through several stages during their development. What is the earliest stage in which the cell becomes haploid?
a. sperm
b. secondary spermatocyte
c. spermatogonium
d. spermatid
Ans: b. secondary spermatocyte
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Urine via percutaneous aspiration is:
a. acceptable. b. not acceptable.
In a large population on a Pacific island, a few individuals had a mutation that caused them to have
different colored eyes. After a hurricane, the population was reduced to only a few individuals, but some of those individuals had the rare eye color mutation. Now, after many generations, almost half of the population on this island has different colored eyes. This is an example of _____________. Fill in the blank(s) with the appropriate word(s).
Organisms that are nocturnal are more likely to communicate using
A) sight and sound. B) sight and smell. C) smell and sound. D) touch and taste.
Which of the following does the central nervous system use for the action of pulling your hand away from a hot object?
A) sensory neurons B) receptors C) glial cells D) motor neurons