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

Biology & Microbiology

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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.

Biology & Microbiology

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

Biology & Microbiology

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.

Biology & Microbiology

The most abundant mineralocorticoid is

a. epinephrine. b. norepinephrine. c. aldosterone. d. cortisol. e. estrogen.

Biology & Microbiology