A protein coat that enclosed a viral genome is known as a(n)
A) capsule.
B) envelope.
C) capsid.
D) prophage.
Answer: C
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Which type of nutrient can pass across epithelial cells without any expenditure of ATP?
A. iron B. calcium C. protein D. fat E. magnesium
Glycogen can be used as an energy source in the body; what is glycogen made of?
a. lipids b. amino acids c. glucose d. nucleic acids
Phosphorylase activity removes a phosphate from GTP.
a. true b. false
Why can't plants use N2 directly as a nutrient?
A) The N2 molecule is too large to enter the stomata. B) Most soils are depleted of N2 as a nutrient. C) N2 diffuses out of leaves as quickly as it diffuses in, so it has to be "fixed" to remain in leaves. D) Plants lack the enzymes necessary to convert N2 into NO3?or NH4+. E) Plants must use NO3? to carry out nitrogen fixation.