23a. [2pt] The lac operon is an inducible operon, whereas the trp operon is a re

Question

23a. [2pt]
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.

Answer:  
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23b. [2pt]
Wild-type E. coli is growing in medium with both glucose and lactose. Which of the following would be true? If the first is true and the others false, enter TFFFF.

The lac repressor is bound to the lac operator.

cAMP is bound to the CAP protein.

CAP protein is bound to the CAP binding site near the lac promoter.

RNA Polymerase is bound to the promoter.

Allolactose is bound to the lac repressor.

Explanation / Answer

TTTFF

TFFTT

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