Interferons
a. make cells resistant to viral infection.
b. are host specific.
c. only work on specific viruses.
d. do not directly inactivate viruses.
Answer: C
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A testcross involves
a. two F1 hybrids. b. an F1 hybrid and an F2 offspring. c. two parental organisms. d. an F1 hybrid and the homozygous dominant parent. e. an F1 hybrid and an organism that is homozygous recessive for that trait.
Evolution through natural selection will occur most rapidly for populations of plants that
A. are already well adapted to the environment. B. live in an unchanging environment. C. are in the same genus. D. reproduce sexually and live in an unstable environment
The human microbiome is very uniform across the entire species Homo sapiens in all geographic locations.
Answer the following statement true (T) or false (F)
A toothed, biting structure found in the mouths of sea urchins that is used for rasping algae is called:
a. a tube foot. b. Aristotle's lantern. c. a pedicellaria. d. an ambulacral groove. e. a dermal denticle.