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Learning objective

Explain DNA and histone association in eukaryotic chromosomes.

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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

Explain DNA and histone association in eukaryotic chromosomes

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

Key concepts

chromosomeDNA

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 best describes the role of histones in eukaryotic chromosomes?

Direct answer

Histones are proteins that help package DNA into a compact, organized structure known as chromatin.

Key terms

  • Histone: A type of protein that DNA wraps around to form nucleosomes, aiding in the packaging of DNA into chromosomes.
  • Nucleosome: The fundamental unit of chromatin, consisting of a segment of DNA wound around a core of histone proteins.

Common trap

Confusing DNA and histone functions: Remember that DNA contains the genetic code, while histones are structural proteins that help organize and regulate access to this DNA.

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