2.9.1

Viruses

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Viruses

Viruses are tiny, non-living (do not have cells) particles that can reproduce rapidly within the body.

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Invasion

  • To survive and replicate, they invade host cells (animals or plant cells).
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Replication

  • The virus particle inserts its own DNA into the host cell’s DNA, which is then copied and used to make more viruses.
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Invaded cells burst

  • Once the new virus particles have been synthesised (made), they cause the cell to burst.
  • This releases the new viruses to invade more cells.
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Illness

  • This cell damage makes us feel ill.

Jump to other topics

1Unity & Diversity - Molecules

2Unity & Diversity - Cells

3Unity & Diversity - Organisms

4Unity & Diversity - Ecosystems

5Form & Function - Molecules

6Form & Function - Cells

7Form & Function - Organisms

8Form & Function - Ecosystems

9Interaction & Interdependence - Molecules

10Interaction & Interdependence - Cells

11Interaction & Interdependence - Organisms

12Interaction & Interdependence - Ecosystems

12.1Populations & Communities

12.2Transfers of Energy & Matter

13Continuity & Change - Molecules

14Continuity & Change - Cells

15Continuity & Change - Organisms

16Continuity & Change - Ecosystems

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