Question

number of luxury genes in lac operon​

Answer 1

Answer:

three genes

The lac operon contains three genes: lacZ, lacY, and lacA.

Answer 2

There are three luxury genes in lac operon- Lac Z, Lac Yand Lac A.

• Luxury genes are also referred to as non-constitutive genes which do not always get expressed in a cell.

• These genes are regulated with the help of inducers or repressors according to the need of the cell.

They can be of two types- inducible and repressible.

In case of lac operon

• The expression of the structural genes is turned off with the help of the lac repressor ( produced constitutively) until some inducer ( lactose) is added.

• In presence of the inducer, it binds to the repressor, thereby inactivating it. This leads to the production of the structural genes-

lacZ- beta-galactosidase

LacY- permease

LacA- galactoside acetyltransferase