When Are the Structural Genes in the Tryptophan Operon Transcribed

question 22

Multiple Choice

When are the structural genes in the tryptophan operon transcribed?
1) Tryptophan is in abundance in the environment.
2) Tryptophan is absent from the environment.
3) Tryptophan is present in low amounts in the environment.

• A) 1
• B) 2
• C) 3
• D) 1 and 3
• E) 2 and 3

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