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What is the expression of the trp operon in the presence of tryptophan?Group of answer choicesThe trpR protein does not bind, so there is no expression from the trp operonThe trpR protein does not bind, so the trp operon is expressed.The trpR protein binds so the trp operon is expressedThe trpR protein binds so the trp operon is not expressed

Question

What is the expression of the trp operon in the presence of tryptophan?Group of answer choicesThe trpR protein does not bind, so there is no expression from the trp operonThe trpR protein does not bind, so the trp operon is expressed.The trpR protein binds so the trp operon is expressedThe trpR protein binds so the trp operon is not expressed

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Solution

The correct answer is "The trpR protein binds so the trp operon is not expressed".

Here's the step by step explanation:

  1. The trp operon is a group of genes that are used, or transcribed, together that codes for the components for production of tryptophan.

  2. The trpR protein is a repressor protein that binds to the operator of the trp operon.

  3. In the presence of tryptophan, tryptophan acts as a corepressor. This means that tryptophan will bind to the trpR protein (repressor) and cause a conformational change.

  4. This change allows the trpR protein to bind to the operator of the trp operon.

  5. When the trpR protein is bound to the operator, RNA polymerase is blocked from transcribing the operon.

  6. Therefore, the genes in the trp operon are not expressed in the presence of tryptophan.

This problem has been solved

Similar Questions

The trp repressor proteinGroup of answer choicesShares the same promoter as the structural genesBinds non-specifically to the trp operatorHas an allosteric binding site for tryptophan (the co-repressor)Is the product of an inducible geneIs active in its native conformation

Which of the following describes the trpR gene?Group of answer choicesIt is a gene in the trp operon, and it activates the expression of the trp operon.It produces a protein that binds to the trp operon and represses the expression of the trp operonIt is a gene in the trp operon and it represses the trp operon.It produces a protein that binds to the trp operon and activates the expression of the trp operon

What is the effect of tryptophan and allolactose binding on the function of the trpR protein and the lacI protein respectively?Group of answer choicesThe trpR protein binds the DNA when it is NOT bound to tryptophan, and the lacI protein binds the DNA when it is NOT bound to allolactose.The trpR protein binds the DNA when it is bound to tryptophan, and the lacI protein binds the DNA when it is bound to allolactose. The trpR protein does NOT bind the DNA when it is bound to tryptophan, but the lacI protein binds the DNA when it is bound to allolactose.The trpR protein binds the DNA when it is bound to tryptophan, but the lacI protein binds the DNA when it is NOT bound to allolactose.

9 The trp operon is regulated by a(n)activator and inducerrepressor and inducerC) activator and co-repressord) repressor and co-repressor

What is the expression of the lac operon in the presence of lactose?Group of answer choicesThe lacI protein does not bind the lac operator so the lac operon is expressed.The lacI protein does not bind the lac operator so the lac operon is not expressed.The lacI protein binds the lac operator so the lac operon is not expressed.The lacI protein binds the lac operator so the lac operon is expressed.

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