Science Focus Topic 3 Notes: The Cell and Its Structures |
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The Cell
( - Student Resources)
- All cells, plant and animal, have structures and each structure performs a specific function
in order for the cell to maintain life.
- When viewed with a compound light microscope these cell structures become visible to the naked eye.
Cell Structures
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The structures inside the cell are called organelles.
See pgs 122-123
Check out the Virtual Cell Tour
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Plant Cell
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Animal Cell
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Cell Membrane
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Cell Wall
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- are much thicker and more rigid than membranes, providing support for
the plant or fungi
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Cytoplasm
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- distributes materials to different parts of the cell
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Nucleus
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- controls the cell?s activities
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Vacuoles
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- is a membrane-bound sac acting as a storage space for surplus food,
wastes and other substances the cell is unable to use immediately
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Chloroplasts
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- are the structures in which photosynthesis takes place (found in green
plants)
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Cell Size and Function
- to carry out their work, cells need a constant supply of materials, such as oxygen, water and
food particles and they also need to get rid of waste products, all these materials must pass through the cell
membrane, most cells fall into a very narrow range of size between 10 - 50
micrometers (um)
Animal Cell
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Plant Cell
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Topic 3 Review p. 126
WRAP-UP
p. 127
>>>> A good review of Topics 1 ? 3
in this Unit
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