"Clonal selection" and "clonal expansion"
A. implies that each individual lymphocyte produces a single antibody.
B.
describes how a single lymphocyte proliferates in a population of effector cells.
C. depends on an antibody recognizing a specific epitope.
D.
explain how an antigen stimulates the production of matching antibodies.
E. All of the above
E
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In a plant, which of the following is triploid (3n)?
A. Pollen grain B. Embryo sac C. Seed D. Endosperm E. None of the answers are triploid
The activation of B cells involves
A. activation of B helper cells. B. activation of complement. C. secretion of interferon. D. secretion of IL-2. E. binding of helper T cells to class I MHC proteins.
The conical sea floor vents that spout sulfide-rich, super-heated water at temperatures up to 300ºC are called
A. yellow smokers. B. hydrothermal vents. C. warm vents. D. hot vents.
The organism that causes the sexually transmitted disease trichomoniasis is a _____
a. flagellated protozoan c. ciliate b. radiolarian d. apicomplexan