A lac operon of genotype lacI - lacP + lacO + lacZ - lacY+ will produce b-galact

ID: 3164913 • Letter: A

Question

A lac operon of genotype lacI- lacP+ lacO+ lacZ- lacY+ will produce b-galactosidase AND permease when

2. A lac operon of genotype lacI+ lacP+ lacO+ lacZ+ lacY- will produce b-galactosidase BUT NOT permease when

A lac operon of genotype lacI- lacP+ lacO+ lacZ- lacY+ will produce b-galactosidase AND permease when

lactose is present lactose is absent in the presence OR absence of lactose when glucose is present never

2. A lac operon of genotype lacI+ lacP+ lacO+ lacZ+ lacY- will produce b-galactosidase BUT NOT permease when

lactose is present lactose is absent in the presence OR absence of lactose when glucose is present all of the above

Q.1

Option - Never.

The repressor LacI is mutated, so presence or absence of lactose has no influence on the gene expression.

LacZ gene is mutated hence functional b-galactosidase is not produced. Only functional permease is produced by the gene LacY.

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Q.2

Option - Lactose is present.

When lactose is present, it binds to the lactose binding site of repressor LacI and inhibits the repressor.

This is turn will produce functional b-galactosidase (LacZ) and non-functional permease (due to mutation in LacY).

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