Mention the two pairs of nitrogenous bases that are present in a DNA strand and pair with each other by hydrogen bonds.

ICSE Class 10 Biology PYQ · 2025 Paper · Section B

3(iii)Written · 2025 · Section B · 2025 Paper

Mention the two pairs of nitrogenous bases that are present in a DNA strand and pair with each other by hydrogen bonds.

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  1. Adenine (A) pairs with Thymine (T): – Connected by 2 hydrogen bonds.

  2. Guanine (G) pairs with Cytosine (C): – Connected by 3 hydrogen bonds.

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