Which of the following could be an agent of natural selection?
A. accidental death of cows by lightning strikes
B. insects that are eaten after they have reproduced
C. characteristics of female animals that cause males to avoid them
D. increases in the population size
C. characteristics of female animals that cause males to avoid them
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The site-specific recombinases are similar to topoisomerases in what way?
A. They introduce supercoils. B. They require ATP hydrolysis for their activity. C. They promote phosphoryl group transfers in which the net change in free energy is close to zero. D. They also assist in compaction of the DNA. E. They mediate strand invasion reactions.
Long-term exposure to cold can alter metabolism and encourage __________ in which brown adipose
tissue produces heat. Fill in the blank(s) with the appropriate word(s).
Which of the following statements about fruits is NOT true?
A. A blackberry is an example of a simple fruit. B. Most fruits are simple fruits, derived from a single ovary. C. A fleshy fruit has a fleshy pericarp, as in a peach. D. A dry fruit may split at maturity to release its seeds, as in a pea or bean pod. E. A multiple fruit, such as a pineapple, forms from many individual flowers on a stem.
Hereditary material in organisms is
a. DNA b. ATP c. RNA d. chromosomes