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The lac operon consists of...

The lac operon consists of

A

Four regulatory genes only

B

One regulatory gene and three structural genes

C

Two regulatory genes and two structural genes

D

Three regulatory genes and three structural genes

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The correct Answer is:
B
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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.

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.

Lac operon is

The lac operon is turned on when allolactose molecules bind to

The lac operon is an example of :

In the following diagram of the lac operon, which is an operon for inducible enzymes , identify the components and enzymes.

In lac operon, lactose acts are

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