Plants are raised under artificial lights turned off and on by an electric clock. Some are given long periods of light, others short periods. This is an example of
A. an experiment.
B. a theory.
C. deductive reasoning.
D. inductive reasoning.
E. a hypothesis.
Answer: A
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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
How many cell types would we expect to find in the simple primary tissues of plants?
A. One or two simple cell types. B. Several cell types. C. Many cell types. D. This cannot be generalized.
At the end of meiosis I, the resulting two cells are
a. identical in all ways. b. genetically identical. c. genetically different. d. hexaploid. e. prepared to enter interphase so the chromosomes can be replicated.
Which of the following are found primarily in the intestines of humans?
A) gram-negative aerobic rods and cocci B) aerobic, helical bacteria C) facultatively anaerobic gram-negative rods D) gram-positive cocci E) endospore-forming rods