NEET Biology
NEETBiologyMolecular Basis of InheritanceClass 12

What does “DNA structure” actually mean in Molecular Basis of Inheritance, and why does it matter for NEET?

a double helix held by complementary base pairing: adenine with thymine, guanine with cytosine.

In simple words: a double helix held by complementary base pairing: adenine with thymine, guanine with cytosine. Getting DNA structure clear matters because NEET questions on Molecular Basis of Inheritance usually test this idea directly, not just a formula you memorised.

Key point

DNA structure

Common mistake

pairing adenine with guanine or cytosine.

Memory tip

A–T (2 hydrogen bonds), G–C (3 hydrogen bonds) — always.

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