Which of the following is the best description of a precursor metabolite?
A. A macromolecule consumed in the first steps of metabolism
B. An intermediate in the formation of cursor metabolites
C. A carbon skeleton used as a starting substrate
D. An enzyme that is reduced in a metabolic reaction
Answer: C
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The night prior to a football game, the coach tells his students to eat pasta to “carbo load”
their bodies. Excess carbohydrates are stored as __________ in animals.
a. glucose b. simple sugars c. glycogen d. starch
Which of the following best explains why modern seedless vascular plants are confined largely to wet
or humid environments?
a. They require external water for reproduction. b. They do not have true roots. c. They lack stomata. d. They have a dominant sporophyte generation. e. They do not have flowers or fruits.
An enzyme is active in the stomach of an animal but quickly loses its activity when it leaves the stomach. This example illustrates that enzymes are
A) specific to the organs in which they are produced. B) inactivated by movement. C) sensitive to changes in pH. D) digested in the small intestine. E) consumed by the quantities of substrate in the small intestine.
Rapid cell proliferation can result from
a. a mutation inhibiting the action of a positive growth regulator. b. the surgical removal of a benign polyp. c. contact inhibition. d. a cell ignoring a negative growth regulator.