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Cell structure

Cells are the basic units of life. Knowing the structures inside plant and animal cells — and what each one does — underpins much of biology.

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Structures in all cells

  • Cell membrane — controls what enters and leaves the cell.
  • Cytoplasm — jelly-like fluid where most chemical reactions happen.
  • Nucleus — contains DNA and controls the cell's activities.
  • Mitochondria — the site of aerobic respiration, releasing energy.

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1. Which structure is found in a plant cell but NOT in an animal cell?

2. What is the main function of mitochondria?

3. The cell wall of a plant cell is made mainly of…

4. Which part of the cell controls its activities and contains DNA?

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