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GCSE Biology · key term
A weak bond that forms between complementary bases on opposite DNA strands.
Used by Edexcel
Specification 3.4 · Paper 1
Revise: DNA StructureThe complementary bases are joined by weak hydrogen bonds. These bonds act across the middle of the molecule, between bases on opposite strands. They are not the links that form the sugar–phosphate backbone.
Do not say that hydrogen bonds join the sugar–phosphate backbone. They form between complementary bases on opposite strands.
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