How is antibody-mediated immunity different from cell-mediated immunity?
a. Antibody-mediated immunity requires lymphocytes; cell-mediated immunity does not.
b. Antibody-mediated immunity is innate; cell-mediated immunity is not.
c. Antibody-mediated immunity is adaptive; cell-mediated immunity is not.
d. Antibody-mediated immunity requires both B and T cells; cell-mediated immunity
requires T cells but not B cells.
e. Antibody-mediated immunity requires T cells; cell-mediated immunity requires B cells.
D
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How many unique mRNA codons can be constructed from the four different RNA nucleotides?
A. four
B. 12
C. 16
D. 61
E. 64
Which of the following criteria is most useful in determining whether two organisms are related?
A) Both ferment lactose. B) Both are gram-positive. C) Both are motile. D) Both are aerobic. E) Each answer is equally important.
Which one of the following biological polymers is mismatched with its monomer?
A) DNA - nucleotide B) enzyme - amino acid C) chitin - monosaccharide D) protein - amino acid E) cellulose - amino acid
Competitive exclusion is based on the idea that:
a. one species will voluntarily allow the other to survive b. no two species can completely occupy the same niche c. the larger species will always dominate the smaller d. competition is overrated as a factor in species survival e. two species can live together if they share the same niche but use it at different times