What is the expression of the trp operon in the presence of tryptophan?Group of answer choicesThe trpR protein binds so the trp operon is expressedThe trpR protein does not bind, so the trp operon is expressed.The trpR protein binds so the trp operon is not expressedThe trpR protein does not bind, so there is no expression from the trp operon
Question
What is the expression of the trp operon in the presence of tryptophan?Group of answer choicesThe trpR protein binds so the trp operon is expressedThe trpR protein does not bind, so the trp operon is expressed.The trpR protein binds so the trp operon is not expressedThe trpR protein does not bind, so there is no expression from the trp operon
Solution
The trpR protein binds so the trp operon is not expressed.
Here's a step-by-step explanation:
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The trp operon is a set of genes involved in the synthesis of the amino acid tryptophan in bacteria.
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The trpR protein is a repressor protein that regulates the expression of the trp operon.
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In the presence of tryptophan, the trpR protein binds to the operator region of the trp operon.
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This binding prevents the RNA polymerase from transcribing the genes in the operon, thus inhibiting the synthesis of more tryptophan.
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Therefore, when tryptophan is present, the trpR protein binds and the trp operon is not expressed.
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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