All of the following are components of an amino acid EXCEPT a(n)
A. carboxyl group.
B. pentose group.
C. amino group.
D. ?-carbon.
E. R group.
Answer: B
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Glucose and fructose both have the chemical formula (C6H12O6) so they are considered
A) isotopes. B) polymers. C) monomers. D) isomers. E) isogenic.
Male northern elephant seals compete with one another for territories along the beach. Males will defend these territories throughout the breeding season
The males that win the male–male competitions defend the "best" beaches, and will have access to mate with females that stay on the beach. Female northern elephant seals (Mirounga angustirostris) come up on a beach during breeding season. Different areas on the beach are defended by a single male; when females haul-out they join a group of females in one specific area on the beach. They disproportionately breed with the male that defends that area of the beach. At what point may intersexual selection occur in these elephant seals? A. when the female is swimming to the beach B. when the female lands on the beach and chooses her resting location C. when the male defends his group of females against a different male D. when the male mates with a female within his group E. when the female leaves the beach after mating with a male
After 30 cycles of PCR cloning of a segment
of DNA, how many copies of that segment will there be?
a. 1000 b. 10,000 c. 100,000 d. 1,000,000 e. 1,000,000,000
The nuclear pore complex of proteins is estimated to have a mass
a. smaller than that of a ribosome. b. about the same as that of a ribosome. c. about five times that of a ribosome. d. about 30 times that of a ribosome.