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

Correct Answer - d
(d) : An operon is a part of genetic material (or DNA) which acts as a single regualted 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 opera. An inducible operon system is a regulated unit of genetic material which is switched on in response to the presnce of a chemcial.