The conditions which regulate the expression of genes are

(1)Environmental

(2)Physiological

(3)Metabolic

(4)All of the above

The development and differentiation of embryo into adult organisms are result of

(1)chemical regulation of expression of several sets of genes

(2)Electrical and Chemical regulation of expression of several sets of genes

(3)coordinated regulation of expression of several sets of genes

(4)All of above

Promoter regions of lac operon can be accessed by

(1)RNA polymerase

(2)DNA polymerase

(3)Proteins

(4)All of these

The lac in lac operon refers to

(1)lactose but not lactase

(2)lactase but not lactose

(3)lactobacillus but not lactose

(4)lactose as well as laevorotatory

The i-gene in lac operon refers to

(1)inducer

(2)inhibitor

(3)sometimes inducer sometimes inhibitor

(4)neither inducer nor inhibitor

In lac operon

(1) 3 structural, 1 operator and 2 promoter genes are present

(2) 3 structural, 1 operator and 1 promoter genes are present

(3) 3 structural, 2 operator and 1 promoter genes are present

(4) 3 structural, 1 operator and 3 promoter genes are present

For lactose metabolism

(1) all three gene products are required

(2) only regulator gene products are required

(3) only Beta-galactosidase are required

(4) Beta-galactosidase and permease are required

In lac operon, repressor is inactivated by

(1)interaction with enzyme

(2)interaction with protein

(3)interaction with carbohydrate

(4)interaction with nucleic acid

Lac operon is an example of

(1) both positive and negative regulation

(2)only negative regulation

(3)only positive regulation

(4)sometimes positive sometimes negative

Regulation of lac operon can be visualised as regulation of enzyme synthesis by its

(1) substrate

(2)lactose

(3)carbohydrates

(4)All of these