SIV causes symptomless infections in monkeys and apes, yet causes AIDS-like disease in chimpanzees. HIV is closely related to SIV and causes AIDS in humans. Which of the following is the best explanation for these observations?
A. The effects of viruses on different species is random.
B. Chimpanzees and humans have a more recent common ancestor.
C. SIV is most likely latent in chimpanzees.
D. Monkeys, apes, and chimpanzees are all genetically very similar.
E. SIV is most likely lytic in apes and monkeys.
B. Chimpanzees and humans have a more recent common ancestor.
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Recent discoveries of microscopic fossils have extended the known history of life to about:
A. 1 billion years ago. B. 2 billion years ago. C. 3.5 billion years ago. D. 4.5 billion years ago.
The parasympathetic ganglia are arranged in an orderly chain along the spinal cord
Indicate whether the statement is true or false.
Life tables provide data concerning
a. expected life span. b. reproductive age. c. death rate. d. birth rate. e. all of these.
Which of the following is the feature that choanoflagellates received their name after?
a. eye spot b. cilia c. flagellum d. collar