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

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

Regulation of gene expression in prokaryotes predominantly takes place at

(1)transcriptional

(2)translational level

(3)splicing gene

(4)transportation of m-RNA from cytoplasm to mesosomes

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

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

How long the lac operon would be expressed in the presence of lactose?

(1) When glucose is more than lactose concentration

(2) As long as lactose is more than galactose concentration

(3) As long as lactose is more than glucose concentration

(4) when lactose equals glucose concentration