Cell Theory (Topic 2)

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  • Created by: AV
  • Created on: 05-11-12 20:58

1. During Metaphase:

  • Centrioles appear and move towards opposite ends of the cell. Microtubules in the cytoplasm start to form spindles.
  • Centromeres divide and spindle fibres contract, pulling chromatids to opposite poles and become chromosomes.
  • Cytoplasm divides producing two new identical daughter cells.
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2. A Nanometre in metric units is displayed as:

  • 0.000 000 001m
  • 0.000 001m
  • 0.000 000 0001m

3. Movements by Globular or Carrier Proteins involve:

  • Reactions with Enzymes to operate the pump.
  • Reactions with ATP to change the shape & position of the pump molecules
  • Reactions with ATP to break open pump pores.

4. Bulk Transport involves:

  • Simple & Facilitated Diffusion of molecules/ions.
  • Movement of Vesicles across a membrane known as cytosis
  • The modification and construction of Vesicles

5. What is the approximate thickness of a cell membrane?

  • 10nm
  • 100nm
  • 1nm
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