Rolling circle replication of the lambda genome differs from replication of a bacterial chromosome in that
A) bidirectional replication forks are not formed.
B) only a single strand of the genome is copied.
C) no concatamers are formed.
D) only a single strand of the genome is copied and no concatamers are formed.
Answer: A
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The anterior end of a tapeworm is known as the:a
protonephridia. b. proglottid. c. cnidocyte. d. auricle. e. scolex.
Citrus fruit has always been distributed from areas where the fruit is grown to other parts of the country, often by train. In the early 1900s train cars were heated with coal, and it was believed that this heat helped ripen the fruit. Imagine the
surprise of growers and suppliers when fruit that arrived in new boxcars heated by steam arrived unripe. Why did the fruit no longer ripen? A) The length of time needed to ripen the fruit was met by slow-moving older trains; newer steam-powered locomotives arrived before the fruit ripened. B) Ethylene, a by-product of coal burning, ripened the fruit in the cars with the coal stove but was absent from the steam-powered trains. C) The light from the coal-burning stoves caused the fruits to experience short nights, so without this light, they no longer ripened. D) The steam prevented the buildup of abscisic acid, which is needed to ripen fruit.
Match the correct case study in conservation biology with its animal.
A. fruit bats—introduction of new species B. prairie chickens—loss of genetic diversity C. songbirds—introduction of new species D. whales—pollution E. Lake Victoria cichlids—loss of habitat
The genotype of an organism constitutes its observable characteristics
A. true B. false