Which type of cells is the HIV virus able to infect?
A. B lymphocytes and nervous tissue
B. red blood cells and liver cells
C. macrophages and T lymphocytes
D. brain cells and glands
E. intestine and T lymphocytes
Answer: C
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Which of the following represents one of the theories for the sudden change in diversity called the Cambrian Explosion?
a. sudden extreme cooling of the Earth’s climate b. asteroid impact c. rising atmospheric oxygen levels d. migration introduction of new diseases
The main point of entry of water into the blood of freshwater fishes is through the:a
skin. b. gills. c. tail. d. anus. e. eyes.
Which is most likely to cause genome evolution in mammals with small population sizes?
A. Purifying selection on synonymous mutations and positive selection on non-synonymous mutations B. Accumulation of synonymous mutations and purifying selection against non-synonymous mutations C. Positive selection on nonsynonymous mutations and accumulation of synonymous mutations D. Purifying selection on synonymous mutations and an accumulation of non-synonymous mutations
Eastern and western meadowlarks look almost identical and sometimes inhabit the same areas of prairies. They recognize members of their own species by distinctive songs and thus do not breed with each other. This is an example of:
A) ecological isolation. B) no isolation mechanism. C) behavioral isolation. D) geographic isolation.