Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).Assertion (A) :Polymerase chain reaction is used in DNA amplificationReason (R) :The ampicillin resistant gene is used as a selectable marker to…

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).

Assertion (A) :

Polymerase chain reaction is used in DNA amplification

Reason (R) :

The ampicillin resistant gene is used as a selectable marker to check transformation

In the light of the above statements, choose the correct answer from the options given below :

1. (A) is not correct but (R) is correct

2. Both (A) and (R) are correct and (R) is the correct explanation of (A)

3. Both (A) and (R) are correct but (R) is not the correct explanation of (A)

4. (A) is correct but (R) is not correct

Doubtly Asked 30 Oct 2026 NEET UG 2022 Practice test neet Save WhatsApp Report

1 answer

Best answer

Answer: 3. Both (A) and (R) are correct but (R) is not the correct explanation of (A)

Check each statement and then the link between them.

A: PCR amplifies DNA in vitro, so A is true.
R: an ampicillin resistance gene is a selectable marker, used to pick out transformed cells, so R is true.

However, selecting transformants has nothing to do with how PCR amplifies DNA, so R does not explain A. Option 3.

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report

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