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DNA

Adenine and t...

Question

Adenine and thymine are held together by .......... hydrogen bonds, while guanine and cytosine are linked by .......... hydrogen bonds.

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Solution

Adenine and thymine are held together by two hydrogen bonds, while guanine and cytosine are linked by three hydrogen bonds.

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Q. The number of hydrogen bonds between Guanine and Cytosine; and between Adenine and Thymine in DNA are:

Q. Assertion :The two strands of DNA are complementary to each other. Reason: Adenine specifically forms hydrogen bonds with guanine whereas cytosine forms hydrogen bonds with thymine.

STATEMENT-1 : Guanine unites with cytosine with three hydrogen bonds but it forms only one hydrogen bond with thymine.
STATEMENT-2 : Guanine and cytosine are purines while that of thymine is a pyrimidine.

STATEMENT-1 : Adenine pairs with thymine but not with cytosine.
STATEMENT-2 : With cytosine no hydrogen bonds are possible for adenine.

Statement 1: The four nitrogen bases in a DNA molecule are guanine, thymine adenine, cytosine.

Statement 2: Where adenine and thymine are purines and guanine and cytosine are pyrimidines.

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