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Learning objective

Describe each nucleotide as containing a sugar, phosphate group and one of four bases.

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Topic

Reproduction

Subtopic

DNA structure (biology only)

Aqa Gcse BiologyInheritance, variation and evolution

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Quick explanation

Describe each nucleotide as containing a sugar, phosphate group and one of four bases

  • This point belongs to Reproduction, especially DNA structure (biology only).
  • You need to be able to describe each nucleotide as containing a sugar, phosphate group and one of four bases.
  • The key ideas to know are T, G, and A.
  • Use the linked flashcards and practice questions to check recall, then practise applying the idea in an exam-style answer.

Key concepts

TGAbasesnucleotideC

Why it matters

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

Quick student answer

How does each nucleotide work?

Direct answer

In Biology, this page helps you answer questions about each nucleotide within Reproduction. Focus on the key process, correct scientific terms, and how the idea links to exam-style questions. Key terms to check are nucleotide and double helix.

Key terms

  • nucleotide: A nucleotide is the basic building block of DNA, consisting of a sugar, a phosphate group, and one of four nitrogenous bases (adenine, cytosine, guanine, or thymine).
  • double helix: The double helix is the structure of DNA, formed by two strands of nucleotides twisted around each other, with bases pairing specifically (A with T and C with G).

Common trap

Forgetting the phosphate group: Remind students that a nucleotide consists of a five‑carbon sugar, a phosphate group attached to the 5’ carbon, and one of the four nitrogenous bases (A, C, G or T).

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