Horseshoe crabs have lived in the earth’s
oceans for ___ years.
a. about 4 thousand
b. close to 400 thousand
c. less than 40 million
d. over 400 million
e. over 4 billion
D
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A person is infected with HIV. The individual is treated with several drugs, including azidothymidine (AZT). Which of the following is the most immediate effect of this drug?
A. It allows reverse transcriptase to proofread, and this will allow successful treatment with a vaccine. B. It does not allow the virus to make a DNA copy of its genome. C. It does not allow the viral genome to become integrated into the host genome. D. It inhibits formation of the capsid. E. It inhibits budding, as it is the reverse of the process by which HIV enters a cell.
The shape of a virus is determined by its
A. envelope. B. RNA. C. DNA. D. coat protein organization. E. host.
. The structure labeled "D" is the ____
a. aorta b. right atrium c. left atrium d. trunk of the pulmonary arteries e. superior vena cava
If pregnancy occurs, a layer of tissue associated with the embryo secretes the hormone ________, which maintains the activity of the corpus luteum in the ovaries of the mother
Fill in the blank(s) with correct word