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Learning objective

Describe (HT only) how complementary bases pair, with C linked to G and T linked to A.

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Topic

Reproduction

Subtopic

DNA structure (biology only)

Aqa Gcse BiologyInheritance, variation and evolution

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Quick explanation

Describe (HT only) how complementary bases pair, with C linked to G and T linked to A

  • This point belongs to Reproduction, especially DNA structure (biology only).
  • You need to be able to describe (HT only) how complementary bases pair, with C linked to G and T linked to A.
  • The key ideas to know are HT only, G, and C.
  • Use the linked flashcards and practice questions to check recall, then practise applying the idea in an exam-style answer.

Key concepts

HT onlyGCTAbases

Why it matters

This objective helps connect DNA structure (biology only) to exam-style questions, flashcards, and revision notes for Reproduction.

Quick student answer

What are (HT only) how complementary bases pair, with C linked to G and T linked to A?

Direct answer

In Biology, this page helps you answer questions about (HT only) how complementary bases pair, with C linked to G and T linked to A within Reproduction. Focus on the key process, correct scientific terms, and how the idea links to exam-style questions. Key terms to check are Complementary base pairing and Base pairing rule.

Key terms

  • Complementary base pairing: The specific matching of nitrogenous bases in DNA, where cytosine (C) pairs with guanine (G) and thymine (T) pairs with adenine (A), forming the double‑helix structure.
  • Base pairing rule: The principle that dictates which bases pair together in DNA: C↔G and A↔T, ensuring accurate replication and transcription of genetic information.

Common trap

Misidentifying base‑pairing rules: Remind them that adenine (A) always pairs with thymine (T) and cytosine (C) always pairs with guanine (G); the A–T and C–G pairs are the only correct complementary pairings in DNA.

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