The inducer of lac operon is :

1. Beta galactosidase

2. Galactose

3. Lactose

4. Glucose

Regulation of lac operon by repressor is referred to as:

1. Inducible regulation

2. Repressible regulation

3. Negative regulation

4. Positive regulation

Select the two statements out of the four (A - D) given below about lac operon.

(A) Glucose or galactose may bind with the repressor and inactivate it

(B) In the absence of lactose, the repressor binds with the operator region

(C) The z-gene codes for permease

(D) This was elucidated by Francois Jacob and Jacques Monod

The correct statements are

1. (B) and (C)

2. (A) and (C)

3. (B) and (D)

4. (A) and (B)

In the lac operon model, lactose molecules function as:-

1. inducers, which bind with the operator
gne

2. repressors, which bind with the operator
gene

3. inducers, which bind with the repressor
protein

4. corepressors, which bind with repressors
protein

In E.coli the conversion of lactose in galactose and glucose takes place by

(1)Beta-galactokinase

(2) Beta-guluctosidase

(3) Beta-galactosidase

(4) Beta-lactosidase