Helper T cells
A. function in allergic reactions.
B. directly destroy target cells.
C. activate B cells and other T cells.
D. secrete antibodies.
E. suppress immune reactions.
Answer: C
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A mutation in the gene encoding the enzyme that cuts F factor DNA during conjugation would result in
A. an inability to separate the recipient DNA from the donor DNA. B. an inability to draw the conjugated cells close enough to allow DNA transfer. C. the transfer of single-stranded DNA instead of double-stranded DNA. D. the inability of the donor DNA to move through the pilus. E. the inability of the recipient cell to replicate the F factor after transfer.
In what type of population would evolution occur most rapidly?
A) a large population with a large gene pool B) a small population with a relatively diverse gene pool C) a small population with a small gene pool D) a large population with a relatively limited gene pool
Prepare an argument for why the following statement is incorrect: The formed elements are the only important part of blood, and plasma is just the water they're carried in
What will be an ideal response?
Which of the following is not a virulence factor of Shigella species?
A) the manufacture of several toxins that damage intestinal cells and induce fluid efflux B) the capability to cause stomach ulcers C) the ability to escape from phagocytes D) the capacity to pass between infected cells using an actin propulsion system E) a system that induces host cells to endocytose the bacteria