Sex pili are prokaryotic structures that are used
A) for gathering prey.
B) for movement.
C) during conjugation.
D) during binary fission.
E) for adhering to surfaces.
C
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In breast tumors the presence of multiple copies of the HER2 gene is correlated with a more aggressive cancer
Which of the following methods would allow comparison of different cancer cells to determine which have more copies of the HER-2 gene? A. PCR with primers that contain restriction sites B. RT-PCR C. quantitative PCR D. PCR with conventional primers E. All of these choices are correct.
According to the _____, modern humans originated in, and migrated out of, East Africa
a. haplotype data of mitochondrial DNA sequences b. haplotype data of Y chromosome sequences c. out-of-Africa model d. multiregional model e. fossil record
The vertebrate autonomic system
a. carries signals to and from visceral organs. b. is a functional division of the peripheral nervous system. c. includes the sympathetic and parasympathetic divisions. d. includes afferent and efferent nerve fibers. e. includes all of these descriptions.
The most abundant mineralocorticoid is
a. epinephrine. b. norepinephrine. c. aldosterone. d. cortisol. e. estrogen.