Liver cells differ from skin cells mainly because they…
A. have unique ribosomes.
B. use different genetic codes.
C. contain different genes.
D. express different genes.
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For a repressible operon to be transcribed, which of the following conditions must occur?
A. A corepressor must be present.
B. RNA polymerase and the active repressor must be present.
C. RNA polymerase must bind to the promoter, and the repressor must be inactive.
D. RNA polymerase must not occupy the promoter, and the repressor must be inactive
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