The following is a diagram of the trp operon, which codes for genes that are par

Question

The following is a diagram of the trp operon, which codes for genes that are part of a biosynthetic pathway that is used to make tryptophan. The genes within the operon are expressed only when tryptophan is absent from the environment. When tryptophan is present, the trp repressor (trpR) is bound to the operator and the biosynthetic genes are repressed Operon trpR P O trpE trpD trpC trpB trpA trpE trpD trpC trpA trpB Biosynthetic Pathway phosphoribosyl- anthranilate anthranilic chociniaera ille phhiphttryptophan ndoleglycerol phosphate CDRP acid Based on this information, which of the following statements about the operon is false? Select one a. the gene encoding the messenger RNA is polycistronio b. a mutation in a biosynthetic gene would stop the pathway from operating normally and tryptophan would not made c. a mutation in trpR that prevents it from binding to DNA would cause tryptophan to be made d. a mutation in the promoter would cause the trpR protein to bind irreversibly, thereby preventing tryptophan from being made e. none of the above, all are true

Explanation / Answer

(d) is the false statement because trpR binds to the operator not to the promoter so a mutation in promoter would not cause trpR to bind to the irreversibly.

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