Chromosomes are copied during what stage of the cell cycle?
a. M
b. D
c. G1
d. G2
e. S
ANSWER: e
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In addition to highly repetitive and unique DNA sequences, a third category of DNA sequences exists. What is it called, and which types of elements are involved in it?
A) dominant DNA; euchromatin and heterochromatin B) multiple gene family DNA; hemoglobin and 5.0S RNA C) permissive DNA; centromeres and heterochromatin D) moderately repetitive DNA; SINEs, LINEs, and VNTRs E) composite DNA; telomeres and heterochromatin
Prior to using PCR to introduce mutations into DNA in vitro, what was a common method of mutagenesis used by scientists?
A. Physical manipulation of DNA (e.g. vortexing) B. Chemicals to induce mutations C. Self-fertilization of plants or inbreeding of animal models D. Using only old parents to set crosses in plants and animals
During an erection, blood pressure in the penis is decreased
Indicate whether the statement is true or false
As electrons move through the mitochondrial space
A) NADH is reduced. B) water is oxidized. C) ATP synthase works by active transport. D) the pH of the intermembrane space changes.