IGCSEBiologyEdexcelRevision Notes3. Reproduction & InheritanceInheritance3.16B DNA Structure

3.16B DNA Structure (Edexcel IGCSE Biology)

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The Structure of DNA

  • DNA, or deoxyribonucleic acid, is the genetic material found in the nucleus of a cell
  • DNA, is a polymer made up of two strands coiled around to make a double helix
  • The strands are formed from a sugar phosphate backbone with bases joined together by complementary base pairing
    • Adenine pairs with thymine
    • Guanine pairs with cytosine

  •  Cell division and protein synthesis both rely on these base-pairing rules because each half of the DNA double helix acts as a template to be copied in order to create a complete new double helix

DNA double helix formation, downloadable AS & A Level Biology revision notes

The structure of DNA and complementary base pairs

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    Lára

    Author: Lára

    Lára graduated from Oxford University in Biological Sciences and has now been a science tutor working in the UK for several years. Lára has a particular interest in the area of infectious disease and epidemiology, and enjoys creating original educational materials that develop confidence and facilitate learning.