3.1.4

Communicable Disease - 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

1Cell Biology

1.1What's in Cells?

1.2Cell Division

1.3Transport in Cells

2Organisation

2.1Principles of Organisation

2.2Enzymes

2.3Circulatory System

2.4Non-Communicable Diseases

2.5Plant Tissues, Organs & Systems

3Infection & Response

4Bioenergetics

5Homeostasis & Response

5.1Homeostasis

5.2The Human Nervous System

5.3Hormonal Coordination in Humans

5.4Plant Hormones

6Inheritance, Variation & Evolution

6.1Reproduction

6.2Variation & Evolution

6.3Genetics & Evolution

6.4Classification

7Ecology

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