Question

Choose the incorrect statement for lysogenic mode.

(a) PRE forms cI gene product which is responsible for activation of promoters

(b) The cII protein is responsible for interfering with cro and Q proteins and they are required for lytic life cycle

(c) The cII protein activates the promoter PINT

(d) The Int protein with host protein is responsible for site specific recombination

This question was posed to me during an online exam.

The question is from Bacteriophage Lambda topic in portion Other Vector Systems for E of Genetic Engineering

Answer 1

Right choice is (a) PRE forms cI gene product which is responsible for activation of promoters

The explanation is: The cI gene product is responsible for inactivation of promoters and thus silencing rest of the lambda genome. The cII gene product is responsible for interfering with cro and Q proteins and they are required for lytic life cycle. The cII gene also activates promoter PINT and the Int protein produced along with host protein is required for site specific recombination.