The host cell enzyme that HIV relies on for the synthesis of its genome is a(n) ________.
A. reverse transcriptase
B. DNA-dependent RNA polymerase
C. RNA-dependent RNA polymerase
D. DNA-dependent DNA polymerase
Answer: B
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Histone modification occurs only during early development
A. true B. false
Why aren't ferns commonly found in deserts?
A. Fern fronds are sensitive to UV light. B. Fern spores are unable to resist prolonged dry conditions. C. Ferns are non-vascular and cannot absorb water from deep within the soil. D. Fern pollen is spread by insects that do not occur in deserts.
Stems that coil around surrounding objects for support are
A. always parasitic. B. tendrils. C. stomata. D. rhizomes. E. tubers.
An insufficient supply of chemical energy in the diet or a shortage of one or more essential nutrients results in __________.
a. malnutrition b. undernourishment c. protein deficiency d. hypernutrition e. All of the listed responses are correct.