Assertion :Exonucleases remove nucleotides from the ends of DNA. Reason: Endonucleases make cuts as specific positions within the DNA.

If both Assertion and Reason are correct and Reason is the correct explanation of Assertion.

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If both Assertion and Reason are correct, but Reason is not the correct explanation of Assertion.

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If Assertion is correct but Reason is incorrect.

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If Assertion is incorrect but Reason is correct.

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Solution

The correct option is B If both Assertion and Reason are correct, but Reason is not the correct explanation of Assertion.
Exonucleases are enzymes that are necessary for proofreading and remove nucleotides from the DNA ends and endonucleases are enzymes that cuts at specific positions.
So the correct answer is "If both Assertion and reason are correct but reason is not the correct explanation of assertion".

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Reason (R) We cannot determine order from balanced chemical equation.

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