Question

In lac operon...act as inducer.

Answer 1

In lac operon lactose acts as inducer.

Extra Information :-

• Lactose is the substrate for the enzyme beta-galactosidase.

• Lactose regulates the switching on and off of the operon.

• In absence of a preferred carbon source such as glucose, if lactose is provided in the medium of growth of the bacteria, the lactose gets transported into the cells through the action of permease.

• A very low level of expression of lac operon is needed to be present in the cell at all times to allow the entry of lactose into the cells.