Which statement best describes the mechanism of neutralization?
A) Antigens clump together and are more susceptible to phagocytosis.
B) Cells are neutralized by toxins injected by natural killer cells.
C) It causes pathogenic cells to lyse.
D) An antibody blocks an antigen's activity by binding to it.
E) Pathogens are bound by antibodies and are more susceptible to phagocytosis
Answer: D) An antibody blocks an antigen's activity by binding to it.
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A transposable element composed of an antibiotic resistance gene, a recombinase gene, and inverted repeats is identified in a bacterial genome. This element can be any of the following except
A. an integrated conjugative element. B. a composite transposon. C. an insertion sequence. D. a unit transposon.
Progression through the phases of the cell cycle is regulated by fluctuating concentrations of ____
a. microtubules b. actin c. cyclins d. cyclin-dependent kinases e. histones
Which of the choices below illustrates the control of cardiac output?
a. baroreceptors ? brainstem ? heart b. baroreceptors ? heart ? brainstem c. brainstem ? baroreceptors ? heart d. brainstem ? heart ? baroreceptors e. heart ? baroreceptors ? brainstem
Which test is especially good for bacteria that are not readily cultivated in the lab?
A. Direct fluorescence antibody (DFA) test B. Dichotomous key analysis C. Phage test D. Direct antigen test E. Gram stain