Determine the outcome for the lac operon genotypes shown below: I+P+O+Z-Y+ Assum

Question

Determine the outcome for the lac operon genotypes shown below:

I+P+O+Z-Y+ Assume lactose is present.

Select one:

a. Functional beta-galactosidase and functional permease are produced.

b. Only functional beta-galactosidase is produced. Functional permease is NOT produced.

c. Only functional permease is produced. Functional beta-galactosidase is NOT produced.

d. Functional beta-galactosidase is NOT produced. Functional permease is NOT produced.

I+P+O+Z-Y+ Assume lactose is absent.

Select one: a,b,c,d

I-P+O+Z+Y+/IsP+OcZ+Y- Assume lactose is absent.

Select one: a,b,c,d

I+P+OcZ-Y-/I-P+OcZ+Y+ Assume lactose is present.

Select one: a,b,c,d

I+P+O+Z+Y-/IsP+O+Z+Y+ Assume lactose is absent.

Select one: a,b,c,d

Explanation / Answer

Ans. 1 if lactose is present it binds to the allosteric site of lac repressor, thereby inactivating the operator binding site of repressor protein. This inactivation of lac repressor permits the induction of transcription of the structural genes of lac Operon and functional beta galactosidase and permease produced. So Ans. (a )is correct.

ANS.2 when lactose is absent then both the enzymes will not produced then (d)is correct.

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