A key part of the humoral immune response is _____
A) the cytotoxic T-cell attack of infected host cells
B) the production of antibodies by plasma cells
C) perforation of infected host cells by perforin
D) phagocytosis of pathogens
E) the initiation of programmed cell death in infected host cells
Answer: B
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Researchers often work with temperature-sensitive mutations ________, because null alleles of these genes create mutants that cannot grow under any conditions.
A) that confer antibiotic resistance B) in essential genes C) that affect colony morphology D) that affect metabolism
Which sequence most accurately describes the
complete path of blood through the circulatory system of a fish? a. atrium >>> ventricle >>> gill capillaries >>> atrium >>> ventricle >>> all other capillaries b. atrium >>> ventricle >>> gill capillaries c. gill capillaries >>> atrium >>> ventricle >>> all other capillaries d. gill capillaries >>> all other capillaries >>> atrium >>> ventricle e. none of these
cAMP levels decrease when __________. This results in __________ of CAP
a. lactose levels increase; activation b. lactose levels decrease; inhibition c. glucose levels increase; inhibition d. glucose levels decrease; activation e. glucose levels decrease; inhibition
Which of the following is LEAST associated with the others?
A) horizontal gene transfer B) conjugation C) transformation D) binary fission