Which of the following is composed of a 1:2:1 ratio of carbon to hydrogen to oxygen?
a. carbohydrate
b. protein
c. lipid
d. nucleic acid
e. steroid
ANSWER: a
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What is the purpose of the third phase of the Calvin cycle?
a. carbon fixation b. generation of ATP c. reduction of NADPH d. oxidation of NADPH e. regeneration of RuBP
A colony of mice is treated with a noninfective form of the bacterium Streptococcus pneumoniae. A
new researcher exposes this noninfective form to heat-killed cells of an infective strain. What would be the effect of this action in the mouse population?
a. The mice will all remain healthy. b. Some mice will die, but most will live. c. The mice will get sick with pneumonia. d. Some will get sick with pneumonia, but most will live. e. The mice will become immune to the bacterium.
In seeds, the shift from active metabolism to dormancy, and then reactivation and germination is based
on levels of
a. a number of hormones. b. the temperature response of hormones. c. antagonistic hormone action. d. abscisic acid. e. temperature.
When a gene transcription occurs, which of the following is produced?
a. more DNA b. protein or polypeptide sequences c. messenger RNA d. enzymes e. genetic defects