In the Figure Below, Are the Genes That Encode the Enzymes

question 2

Multiple Choice

In the figure below, are the genes that encode the enzymes needed to make tryptophan on or off?

• A)The genes are on because the genes involved in tryptophan production are housekeeping genes.
• B)The genes are on because the complex of tryptophan and repressor protein allows RNA polymerase to bind to the promoter.
• C)The genes are off because the complex of tryptophan and repressor protein prevents RNA polymerase from interacting with regulatory DNA.
• D)The genes are off because when tryptophan is plentiful in the environment, RNA polymerase is not made.

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