Question

Assertion : Lac operon is a repressible operon.
Reason : The product of gene activity stops the activity of the said gene.

• A. If both assertion and reason are true and reason is the correct explanation of assertion
• B. If both assertion and reason are true but reason is not the correct explanation of assertion
• C. If assertion is true but reason is false
• D. If both assertion and reason are false

Answer 1

Answer: (D)

An operon is a part of genetic material (or $DNA$) which acts as a single regulated unit having one or more structural genes, an operator gene, a promoter gene, a regulator gene, a repressor and inducer or corepressor (from outside). $Lac$ operon is an inducible operon. An inducible operon system is a regulated unit of genetic material which is switched on in response to the presence of a chemcial.