Botany-(general)
NEET Botany (general) Assertion Reason Question
Type: Assertion Reason-assertion-Hard-Class 12
Assertion (A): In the Meselson and Stahl experiment, 15N was used to distinguish between newly synthesized DNA strands.
Reason (R): 15N is a heavy isotope of nitrogen and can be separated from 14N based on densities in a CsCl density gradient.
A
Both A and R are true and R is the correct explanation of A.
B
Both A and R are true but R is not the correct explanation of A.
C
A is true but R is false.
D
A is false.
Correct Answer
Option A
Detailed Explanation
The assertion and reason are both true, and the reason correctly explains the basis of using 15N in the experiment: its density difference allows separation in a CsCl gradient.
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