Question

Choose the correct statement for the infectious particle of lambda phage.

(a) It is single stranded genome

(b) It is circular double stranded genome

(c) The ends are blunt with cos (cohesive) sequences

(d) The ends are created by cleavage at cos sites during phage packaging

I have been asked this question in an online quiz.

Origin of the question is Bacteriophage Lambda topic in chapter Other Vector Systems for E of Genetic Engineering

Answer 1

Right answer is (d) The ends are created by cleavage at cos sites during phage packaging

The best I can explain: The infectious particle of lambda phage id linear double stranded genome. The ends are staggered with cos (cohesive) sequences and they are created by cleavage at cos sites during phage packaging.