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Learning objective

Describe DNA forms in prokaryotic cells and organelles.

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Topic

Genetic information official content

Subtopic

DNA, genes and chromosomes

Aqa A Level BiologyGenetic information, variation and relationships between organisms

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Quick explanation

Describe DNA forms in prokaryotic cells and organelles

  • This point belongs to Genetic information official content, especially DNA, genes and chromosomes.
  • You need to be able to describe DNA forms in prokaryotic cells and organelles.
  • The key ideas to know are DNA.
  • Use the linked flashcards and practice questions to check recall, then practise applying the idea in an exam-style answer.

Key concepts

DNA

Why it matters

This objective helps connect DNA, genes and chromosomes to exam-style questions, flashcards, and revision notes for Genetic information official content.

Quick student answer

Which of the following statements correctly describes the structure of DNA in prokaryotic cells?

Direct answer

DNA in prokaryotic cells is circular and not enclosed within a nucleus, existing as a nucleoid in the cytoplasm.

Key terms

  • Nucleoid: The region in a prokaryotic cell where the circular DNA is located, not enclosed by a membrane.
  • Mitochondrial DNA: The circular DNA found in mitochondria, inherited maternally and distinct from nuclear DNA.

Common trap

Confusing prokaryotic and eukaryotic DNA: Remember that prokaryotic DNA is circular and not associated with histones.

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