Question

Full induction of the lac operon occurs when _____. Select one: a. lactose levels are high and glucose levels are low b. lactose levels are high and glucose levels are high c. lactose levels are low and glucose levels are high d. lactose levels are low and glucose levels are low

Answer 1

Answer:

The suitable option will be - A.

A.  lactose levels are high and glucose levels are low

Explanation:

• Lac operon :

It is a operon that is regulated by a set of genes and is regulated altogether and is transcribed into a single RNA in the presence of lactose.

• It is mainly found in  E.coli. Lac operon is mainly used for lactose metabolism. There are 3 genes in this system - lacZ, lacY, and lacA.
• LacZ codes for β-galactosidase which cleaves lactose into glucose and galactose. LacY codes for Beta-galactoside permease, which helps in the entry of lactose in the cell. LacA codes for Galactoside acetyltransferase.