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Some changes are encountered in the infectious particle as it infects the cell. Choose the incorrect statement.

(a) The infectious particle circularizes upon causing infection by annealing at cos sites

(b) There are two promoters present, PR and PL

(c) Upon infection only PR is activated

(d) Promoters give rise to immediate early transcripts

The question was asked by my college professor while I was bunking the class.

My enquiry is from Bacteriophage Lambda topic in section Other Vector Systems for E of Genetic Engineering

1 Answer

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The correct choice is (c) Upon infection only PR is activated

Easy explanation: As the infectious particle infects the cell it circularizes by annealing at cos sites. Both the promoters PR and PL are activated upon infection. Promoters give rise to immediate early transcripts which terminate at rightward and leftward terminators.

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