Which element is considered a macronutrient needed by plants?
a. manganese
b. iron
c. copper
d. potassium
e. boron
ANSWER: d
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Fatty acids and ribozymes are incompatible as early molecules of life because ____
a. they have different pH requirements b. they most likely developed millions of years apart c. fatty acid vesicles are impermeable to ribozymes bound to ferrous oxide d. magnesium is required for ribozyme function but causes fatty acids to precipitate e. magnesium is required for fatty acids to form vesicles but causes ribozymes to precipitate
Why does reinforcement involve a strengthening of prezygotic, rather than postzygotic, isolation?
A. The rewards of postzygotic isolation are always much smaller than those of prezygotic isolation. B. Reinforcement occurs only rarely. C. Postzygotic isolation has only a minimal evolutionary impact. D. Alleles that prevent interbreeding are more likely to be inherited by viable, nonhybrid offspring than alleles that permit random mating. E. Assortative mating is uncommon.
Antivenin is a(n)
A) antitoxin used to treat snakebites. B) antigen produced from a virus. C) antiserum produced from hybridomas. D) vaccine made toward the endotoxin of a virus. E) vaccine produced against the endotoxin of a bacterium.
_______ can convert proto-oncogenes into oncogenes.
A. Chromosomal translocations B. Gene amplifications C. Retroviral insertions D. Missense mutations E. All of the answers are correct.