In prokaryotes, high levels of cAMP ____
a. are present when glucose levels are high
b. are present when glucose levels are low
c. negatively regulate the lac operon
d. promote CAP production
e. lead to CAP degradation
ANSWER: b
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A heterozygote for a trait exhibiting incomplete dominance will
a. express the dominant trait. b. express the recessive trait c. exhibit an intermediate phenotype. d. express both alleles.
Biologists use a classification system to group organisms in part because organisms
a. are going extinct b. are very numerous and diverse c. are too much alike d. share too many derived characteristics
Which of the following statements regarding antigens and antibodies is false?
A) An antibody usually recognizes and binds to an antigenic determinant. B) A single antigen may stimulate the immune system to make several distinct antibodies to it. C) Most antigens are proteins or large polysaccharides on the surfaces of viruses or foreign cells. D) Each antibody has only one antigen-binding site.
Which of the following assays is a function of the formation of immune complexes?
A) immunoblot tests B) ELISAs C) neutralization tests D) direct fluorescent antibody tests E) precipitation tests