In the Absence of Tryptophan, What Happens to the Genes

question 37

Multiple Choice

In the absence of tryptophan, what happens to the genes within the trp operon?

• A) The regulator without tryptophan-binding prevents the genes from being transcribed.
• B) The regulator dissociates from the operator and structural genes get transcribed.
• C) Lack of tryptophan increases the level of cAMP, which leads to activation of CAP protein and gene expression.
• D) The active repressor binds to the operator and genes do not get transcribed.
• E) The active activator binds to the operator and transcription of structural gene takes place.

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Definitions:

Accounting Profits

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Long Run

A period in economic analysis in which all inputs can be adjusted and no factors are fixed.

Perfect Competition

a market structure characterized by a large number of small firms, producing identical products, with no single firm able to influence the market price.