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Lac operon consists of...

Lac operon consists of

A

Four regulatory genes only

B

Two regulatory genes and three structural genes

C

Three regulatory genes and three structural genes

D

One regulatory gene and three structural genes

Text Solution

Verified by Experts

The correct Answer is:
D
Lac operon consists of one regulatory gene and three structural genes (z, y, a).
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Here are some correct and some wrong statements. Correct only those statements which are wrong: (a) The genetic code is universal. (b) The genetic code is ambiguous. (c) The genetic code is regenerate. (d) Transfer RNA (tRNA) carry amino acids to mRNA codons and used again and again in transcription. (e) UAA, UAG and UGA are terminator codon. (f) Lac operon consists of regulatory genes, operator gene, structural and promoter gene.

Assertion (A): Lactose is the substrate for the enzyme beta-galactosidase and it regulates switching on and off of the lac operon. Reason ( R): The lac operon consists of one regulatory gene and three structural genes.

The lac operon consists of a regulation gene and three structural gene. The lactose acts as inducer. In the presence of an Inducer such as lactose, the repressor is in inactivated during the interaction. This allows RNA polymerase access to the promoter and transcription proceeds. The repressor is synthesized which in turn binds with the operator region of the operon and prevents RNA polymerase from transcribing the operon. Identify the correct sequence of the structural genes in the lac operon.

Lac operon is

Lac operon concept was proposed by

Lac operon is related with :

Lac operon in E.coil, is induced by

The operon is a unit of gene expression. Lac operon in E. coli is an inducible control.