The accumulation of which gas from fossil fuel burning significantly affects global temperatures?
a. carbon dioxide
b. nitrogen
c. oxygen
d. ozone
e. water
ANSWER: a
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If a substance is a neurotransmitter, stimulation of the presynaptic cell should have the same effect as
a. direct application of the proposed substance to the postsynaptic cell. b. stimulation of the postsynaptic cell. c. blocking receptors on the postsynaptic cell. d. inactivating the substance.
A saprobe differs from a parasite in that
A. a saprobe derive nutrients from dead plants and animals, but a parasite derives nutrients from living plants and animals. B. a saprobe is a fungus, but a parasite can be any type of microbe. C. a saprobe does not harm a host that it lives on, whereas a parasite does harm a host. D. a saprobe cannot infect a human, but a parasite is always infectious.
Bacterial enzymes that are part of a rarely used catabolic pathway are usually organized into a(n)
__________. a. inducible operon b. repressible operon c. inducible zinc finger d. repressible leucine zipper e. inducible catabolon
What is the first reactant in the citric acid cycle?
A) pyruvic acid (C3H3O3) B) glucose (C6H12O6) C) carbon dioxide (CO2) D) oxalaoacetate (OAA)