Viruses (Cambridge O Level Biology)

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Cara Head

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Cara Head

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Viruses

  • Viruses are not part of any classification system as they are not considered living things
  • They do not carry out the seven life processes for themselves, instead they take over a host cell’s metabolic pathways in order to make multiple copies of themselves
  • Virus structure is simply
    • Genetic material (RNA or DNA)
    • A protein coat
    • Some viruses contain an outer envelope as shown in the image below
  • As a result, they can only replicate inside living cells

Structure of a virus diagram

structure-of-a-typical-virus-diagram

Structure of a typical virus

  • The structures of viruses can be varied, but all contain the same basic elements of a protein coat and genetic material

Virus Diagram

diversity-of-structure-in-viruses

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Cara Head

Author: Cara Head

Expertise: Biology

Cara graduated from the University of Exeter in 2005 with a degree in Biological Sciences. She has fifteen years of experience teaching the Sciences at KS3 to KS5, and Psychology at A-Level. Cara has taught in a range of secondary schools across the South West of England before joining the team at SME. Cara is passionate about Biology and creating resources that bring the subject alive and deepen students' understanding