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2. Explain the function of the nucleus in cells

  • Structures in the cytoplasm where oxygen is used and most of the energy is released during respiration.
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  • Controls all the activities in the cell. It contains the genes on the chromosomes.
  • Controls the passage of substances into and out of the cell.
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  • A liquid gel in which most of the chemical reactions needed for life take place.

3. Expain the structure and function of the mitochondria

  • Structures in the cytoplasm where oxygen is used and most of the energy is released during respiration.
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4. Give an example of plant cells that do not have Chloroplastsand explain why they have none.

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  • Root cells do not have chloroplasts because they are underground and do not photosynthesise
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5. What are bacterial cells like?

  • They are single celled organisms that are much smaller than animal and plant cells. DConsists of cytoplasm and a membrane surrounded by a cell wall. The genes are not in a distinct nucleus.
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