When antiseptics and disinfectants are compared, antiseptics are generally
A. unpredictable in toxicity.
B. equally as toxic.
C. more toxic.
D. less toxic.
Answer: D
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How are RNA hairpin turns related to termination in E. coli?
A) The turns are formed from complementary base pairing and cause separation of the RNA transcript and RNA polymerase. B) A three-base repeat signals a stop sequence, and the RNA transcript is released. C) Release factors bind to sites on the hairpin turn, causing release of the RNA transcript. D) The hairpin turn prevents more nucleoside triphosphates from entering the active site of the enzymes, effectively shutting off the process of polymerization.
According to MacArthur and Wilson's island biogeography theory, which of the following would be expected to have the smallest species richness?
A. the mainland B. a large island near the mainland C. a large island far from the mainland D. a small island near the mainland E. a small island far from the mainland
There is an autosomal gene that controls baldness, and its expression is sex-influenced. The gene for
baldness (B) is dominant in males but recessive in females. In females, the allele B1 for nonbaldness is dominant over the gene for baldness. If heterozygous, nonbald woman marries a nonbald man, what will be the appearance of their children? Work out the possibilities for each sex. What will be an ideal response?
The difference between a drupe and a berry is that a drupe:a
is an accessory fruit, while a berry is a multiple fruit. b. is formed from a single carpel, while a berry is formed from many carpels. c. has a stony pit around a single seed, while a berry is fleshy throughout with many seeds. d. is a dry fruit, while a berry is a fleshy one. e. splits open along two sutures, while a berry splits open along one suture.