The rate at which mRNA is processed by ribosomes
is an example of
a. transcriptional control.
b. transcript processing control.
c. transport control.
d. translational control.
e. post-translational control.
Answer: d
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Which of the following is the least likely mechanism for reducing the rate of gene transcription by a repressor?
A. The repressor binds directly to the RNA polymerase to block the closed-to-open transition at initiation. B. The repressor induces a conformational change in the polymerase that accelerates the closed-to-open transition. C. The binding of the repressor sterically occludes binding of the RNA polymerase to the promoter. D. The repressor binds directly to the DNA to stabilize the closed complex over the open complex.
Natural selection results in organisms perfectly adapted to their environments
a. True b. False
In plants, the long-distance transport of substances is called transpiration
a. True b. False
Some people are resistant to HIV because______
A. They carry the mutant CCR5 allele B. They have excess white blood cells C. Of previous exposure to the virus D. No one is resistant to HIV