Cholesterol is
a. synthesized in the large intestine.
b. remodeled into vitamin A.
c. used in the construction of cell membranes.
d. a component of plant cell walls.
e. all of these.
Answer: c
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The vertebrate jaw first appeared in
a. fishes. b. amphibians. 272 Test Bank c. reptiles. d. birds. e. mammals.
The maintenance of a high ATP to ADP ratio within cells ensures that:a
the hydrolysis of ADP to ATP will be strongly exergonic. b. the hydrolysis of ATP to ADP will be strongly exergonic. c. the hydrolysis of ATP to ADP will be strongly endergonic. d. the hydrolysis of ADP to ATP will be an energy releasing reaction. e. the conversion of ADP to ATP will proceed spontaneously.
Which of the following cells have reduced or very little active telomerase activity?
A) most normal somatic cells B) most normal germ cells C) most cancer cells
In 1942 a scientist testing part of a radar system discovered that a candy bar in his pocket had melted. Intrigued, he tried placing an egg near the system he was working on; it exploded and splattered him with hot egg. In this way it was discovered that
part of the radar system could be used to cook foods, which led to the development of the microwave oven. When this kind of repurposing occurs in biological systems, it is called A) paedomorphosis. B) mutation. C) exaptation. D) adaptive radiation.