Question

In lac operon,the regulator gene codes for (1)Aporepressor (2)Corepressor (3)Inactive repressor(4)Active repressor

Answer 1

Answer:4

Explanation: lac repressor is active repressor which itself go and bind to operator without others help

Answer 2

Answer:

The answer is 4

Explanation:

The lac operon is an inducible operon that uses lactose as a source of energy and is activated when glucose levels are low, but lactose is present. The lac operon has a repressor-controlled operator, promoter, and structural genes transcribed simultaneously. There are three structural genes encoded by it-

• lacZ codes for -galactosidase, which cleaves lactose into galactose and glucose.
• lacY codes for lac permease, a transmembrane protein required for lactose absorption.
• lacA codes for a transacetylase that transfers an acetyl group from coenzyme A (CoA) to the hydroxyl group of galactosides.

There is a separate gene from structural genes which encodes for-

•  lacI gene, which encodes for a repressor, is located at the 5′ end of the lacZ gene.