The lac operon is an inducible operon, whereas the trp operon is a repressible o

Question

The lac operon is an inducible operon, whereas the trp operon is a repressible operon. Which of the following are true when comparing these two operons? If the first two are true and the remainder false, enter TTFFF.

Inducible operons tend to be associated with catabolic pathways while repressible operons tend to be associated with synthetic pathways.

Inducible operons are repressed when their effector molecule (e.g. lactose) is present while repressible operons are induced when their effector molecule (e.g. tryptophan) is present.

The repressor molecules of inducible operons are allosteric proteins while the repressor molecules of repressible operons are not.

Repressible operons are always controlled by negative regulatory proteins and inducible operons are always controlled by positive regulatory proteins.

If the operator of a repressible operon like trp is mutated the expression is constitutive.

Explanation / Answer

Inducible operons tend to be associated with catabolic pathways while repressible operons tend to be associated with synthetic pathways.   TRUE

Inducible operons are repressed when their effector molecule (e.g. lactose) is present while repressible operons are induced when their effector molecule (e.g. tryptophan) is present.      FALSE

The repressor molecules of inducible operons are allosteric proteins while the repressor molecules of repressible operons are not.       FALSE

Repressible operons are always controlled by negative regulatory proteins and inducible operons are always controlled by positive regulatory proteins.   FALSE

If the operator of a repressible operon like trp is mutated the expression is constitutive.   TRUE

The answer is TFFFT

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