Multiple Choice
The trp operon consists of ________ genes that encode tryptophan biosynthesis enzymes.
15. Central Dogma & Gene Regulation
The Trp Operon
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Based on the information you know about the trp operon, is the creation of tryptophan expensive to the cell?
A
Yes, this is why tryptophan is the co-repressor of the trp operon.
B
No, this is why tryptophan is the inducer of the trp operon.
C
Yes, this is why tryptophan is the repressor of the trp operon.
Verified step by step guidance1
Understand the role of the trp operon in bacterial cells: The trp operon is a group of genes that are used to produce tryptophan when it is not available in the environment.
Recognize the concept of a co-repressor: In the trp operon, tryptophan acts as a co-repressor. When tryptophan levels are high, it binds to the repressor protein, enabling it to attach to the operator region of the operon, thus inhibiting transcription.
Consider the energy cost of synthesizing tryptophan: The synthesis of tryptophan requires energy and resources, making it an expensive process for the cell.
Analyze the regulatory mechanism: When tryptophan is abundant, the cell conserves energy by preventing the synthesis of more tryptophan through the action of the trp operon.
Conclude the relationship between tryptophan and the trp operon: Since tryptophan acts as a co-repressor, it indicates that the cell prefers to use environmental tryptophan rather than synthesizing it, due to the high energy cost.
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