The semicircular canals are
a. empty.
b. filled with gas.
c. filled with a liquid.
d. filled with bones or stones.
e. filled with sand grains.
C
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The thin layer of meristematic cells located between xylem and phloem is referred to as the:a
apical meristem. b. collenchyma. c. cork cambium. d. vascular cambium. e. pith.
In which of its forms do plants generally take up nitrogen for their use?
a. mainly as NH4+ b. mainly as N2 c. mainly as NH3 d. mainly as NO3?
Why does it take 10 times more energy to grow a kilogram of beef than a kilogram of wheat?
A) Only 10% of wheat is digestible by cattle. B) Cattle eat only 10% of their body weight. C) Cattle only integrate 10% of their food into biomass. D) A kilogram of wheat weighs less than a kilogram of beef
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 viral genome to become integrated into the host genome. C. It does not allow the virus to make a DNA copy of its 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.