Each reaction in a metabolic pathway is catalyzed by a(n)
a. end product.
b. reactant.
c. substrate.
d. enzyme.
Answer: d. enzyme.
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What is the name for the gap into which neurotransmitters are released?
A. gap junction B. synaptic cleft C. postsynaptic membrane D. presynaptic membrane E. impulse channel
In the figure above, which number identifies the portion of the cell that houses the metabolic
machinery?
a. 1 b. 2 c. 5 d. 8 e. 4
Catabolic pathways that break down complex substances into more usable units are usually regulated in response to the
A) end products of the pathway. B) levels of the molecule that is to be broken down. C) other metabolites that are limiting. D) levels of enzymes in the pathway.
If all of the alleles of a given locus are the same in a population, then the frequency of that allele is
assigned a value of: a. 0.1. b. 1.0. c. 10.0. d. 100.0. e. 1000.0.