Texas A&M University (TAMU) BIOL111 Introductory Biology I Exam 3 Practice Exam

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What happens to the tryptophan operon when tryptophan is plentiful?

It is activated to enhance transcription

It is turned off to halt transcription

When tryptophan is plentiful, the tryptophan operon is turned off to halt transcription. This is part of a regulatory mechanism known as negative feedback. In this scenario, high levels of tryptophan enable the tryptophan molecule to bind to the repressor protein, which then undergoes a conformational change allowing it to bind to the operator region of the operon. When the repressor is bound to the operator, it blocks RNA polymerase from transcribing the downstream genes necessary for tryptophan synthesis.

This regulatory mechanism helps conserve energy and resources by preventing the synthesis of enzymes and proteins that are not needed when tryptophan is already abundant in the cell. The operon architecture ensures that the metabolic pathways are tightly regulated, allowing the cell to respond to changes in nutrient availability efficiently.

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It continues to express genes regardless of levels

It mutates to adapt to the conditions

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