Question

Choose the correct statement with respect to lysogen and prophage.

(a) The integrated phage is called as lysogen

(b) The infected bacterial cell is called a prophage

(c) If there is only growth of few lysogens, the E. coli lawn would be turbid

(d) If lysogens won’t be formed, the plaques won’t be clear

I had been asked this question in quiz.

I need to ask this question from Bacteriophage Lambda in chapter Other Vector Systems for E of Genetic Engineering

Answer 1

The correct choice is (c) If there is only growth of few lysogens, the E. coli lawn would be turbid

Easiest explanation: The integrated phage is called as a prophage and the infected bacterial cell is known as lysogen. Lysogens are immune to further infection by the same phage. If only growth of few lysogens would take place, the lawn would be turbid. In the acse, if lysogens aren’t formed, the plaques would be clear.