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Nucleic Acids

Why there is ...

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Why there is two hydrogen bond in adenine and thymine but in guanine and cytosibe there is 3 Hydrogen bond

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

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.

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