Biology - Chapters 1 and 2

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Anonymous
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99365
Filename:
Biology - Chapters 1 and 2
Updated:
2011-09-01 14:00:32
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Biology
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Description:
Higher Biology - Unit one
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  1. What is a cell?
    The basic unit of life
  2. What is a unicellular organism?
    A unicellular organism consists of one cell which possesses a variety of structures enabling it to perform all the functions necessary for the maintenance of life
  3. What is a multicellular organism?
    A multicellular organism consists of more than one cell. In advanced animals and plants these are arranged into tissues giving a division of labour
  4. Variation in a cell structure exists between cells of one type of tissue and cells of different tissues since cells are _______ to perform particular functions?
    specialised
  5. Name three ways cells absorb molecules in solution
    Osmosis, diffusion and active transport
  6. What is the cell wall in plants made of?
    Cellulose
  7. The cell wall is ______ _______ to solutions?
    freely permeable
  8. What prevents the cell from bursting when water is absorbed?
    The cell wall
  9. The plasma membrane is _______ permeable?
    selectively
  10. What does the plasma membrane consist of?
    protein and phospholipid molecules
  11. How are the molecules in the plasma membrane arranged?
    In the fluid mosaic model
  12. What makes the plasma membrane porus?
    Tiny channels
  13. What kind of molecules are actively transported across the plasma membrane?
    Ions
  14. Does active transport require energy?
    YES!

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