Question

Induction of lysogen takes place because of __________

(a) Low levels of cII gene

(b) Low level of cI gene

(c) Low levels of both cI and cII gene

(d) High levels of both cI and cII gene

This question was posed to me by my school principal while I was bunking the class.

This question is from Bacteriophage Lambda in division Other Vector Systems for E of Genetic Engineering

Answer 1

Right answer is (b) Low level of cI gene

The explanation: Induction of lysogen takes place because of low levels of the cI gene. It is caused by specific proteolysis under the action of host recA protein.