Questions

Is lac operon an inducible operon?

Is lac operon an inducible operon?

The lac operon is considered an inducible operon because it is usually turned off (repressed), but can be turned on in the presence of the inducer allolactose.

Why is the lac operon called inducible?

The lac operon is an inducible operon that utilizes lactose as an energy source and is activated when glucose is low and lactose is present.

What is the difference between a Repressible and an inducible operon?

Summary – Inducible vs Repressible Operon Inducible operon is regulated by a substrate present in the metabolic pathway while repressible operon is regulated by the presence of a metabolic end product known as a co-repressor. This is the main difference between inducible and repressor operon.

What is inducible operon?

An inducible operon is one whose expression increases quantitatively in response to an enhancer, an inducer, or a positive regulator.

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What are the parts of a lac operon?

The lac operon consists of three coding regions in tandem, lacZ, lacY, and lacA. The lacZ gene encodes β-galactosidase, which degrades lactose. The lacY gene product, lactose permease, transports lactose into the cell, and the lacA gene product, lactose acetylase, has an unknown and not usually necessary function.

What is an inducible operon?

What are repressible operons?

A repressible operon is one that is usually on but which can be repressed in the presence of a repressor molecule. The repressor binds to the operator in such a way that the movement or binding of RNA polymerase is blocked and transcription cannot proceed.

What is the difference between the lac operon and trp operon?

What is the difference between Lac operon and Trp operon? Lac operon is involved with the catabolic process of a sugar, but Trp operon is involved in the anabolic process of an amino acid. Lac operon gets activated in the presence of lactose, but Trp operon gets deactivated in the presence of tryptophan.

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Which is not an example of inducible operon?

> The trp operon is repressed by binding tryptophan to the repressor and is thus not an inducible operon, so options A, C, D do not hold true for it.

Which is inducer of lac operon?

Allolactose
Allolactose (1-6-O-β-d-galactopyranosyl-d-glucose) is the inducer of the lac operon when Escherichia coli are grown in the presence of lactose (1-4-O-β-d-galactopyranosyl-d-glucose).