The type of RNA that carries out RNA interference is
A) tRNA.
B) mRNA.
C) rRNA.
D) siRNA.
D) siRNA.
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If a new allele appears in a population, the Hardy–Weinberg formula
(a) cannot be used because no equilibrium exists. (b) can be used but only for two alleles at a time. (c) can be used by lumping all but two phenotypes in one class. (d) can be expanded by adding more terms.
The toxins involved in intestinal infections typically
A. kill cells by inhibiting protein synthesis. B. modify cell physiology resulting in increased secretion of water and electrolytes. C. modify cell physiology resulting in decreased secretion of water and electrolytes. D. kill cells by inhibiting DNA synthesis. E. kill cells by inhibiting protein synthesis AND modify cell physiology resulting in increased secretion of water and electrolytes.
Which term refers to a type of hypersensitivity to self-antigens?
a. autoimmunity b. immunodeficiency c. adaptive immunity d. innate immunity
Referring to the above diagram, what structure
is labeled "C"?
a. the appendix b. the cecum c. a polyp d. a portion of the small intestine e. the colon