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Complementary Base Pairing

The bases on each strand form hydrogen bonds that hold the two strands together.Adenine pairs with thymine and forms two hydrogen bonds. Adenine is complementary to thymine.Guanine pairs with cytosine and forms three hydrogen bonds. Guanine and cytosine are complementary base pairs.

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Specification: AQA Biology (7401), AS-level, 3.1.5.2 DNA replication and 3.1.5.1 Structure of DNA and RNA. Topic: Nucleic Acids.

Key terms in this lesson

hydrogen bond
A weak electrostatic attraction between a slightly positive hydrogen atom on one polar molecule and a slightly negative atom, such as oxygen or nitrogen, on another.

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