The Tryptophan Operon Is a Repressible Operon That Is

question 51

Multiple Choice

The tryptophan operon is a repressible operon that is

• A) permanently turned on.
• B) turned on only when tryptophan is present in the growth medium.
• C) turned off only when glucose is present in the growth medium.
• D) turned on only when glucose is present in the growth medium.
• E) turned off whenever tryptophan is added to the growth medium.

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