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Read the following statements w.r.t. lac...

Read the following statements w.r.t. lac operon.
a. lac-i is the constitutive gene.
b. lac-y codes for permease to increase permeability of cell to `Beta`-galactoside.
c. Lactose is the substrate for the enzyme B- galactosidase and it regulates switching on and off of the operon.
d. Regulation of lac operan can be also visualised as regulation of enzyme synthesis by its substrate.

A

4

B

3

C

2

D

1

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