Question

Assertion: The two strand of DNA helix have uniform distance between them.

Reason: A large sized purine always paired opposite a small sized pyrimidine.​

Answer 1

Answer:

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Explanation:

Assertion is correct, but reason is wrong statement.

Answer 2

Both the assertion and reason are true and the reason is the correct explanation of the assertion.

• The strand of DNA are antiparallel to each other and are equidistant throughout the length.

• This is because the purines are paired with their complementary pyrimidines.

• Purines are double-ring structures that include adenine and guanine whereas pyrimidines are single-ring structures that include cytosine and thymine.

• Adenine is paired with thymine with 2 hydrogen bonds and guanine is paired with cytosine with 3 hydrogen bonds.