Genes, cells and populations

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1. What are the 3 components of the cytoskeleton

  • Microfilaments, microtubules and indeterminate filaments
  • Microtubules, Microfllaments and intermediate filaments
  • Dynein, Kinesin and Mucin
  • Actin, Myosin and Kinesin
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2. Why is the nucleus compartmentalized?

  • To enable gene transcription
  • To enable different pH's to be established
  • To enable gene expression to be regulated by post transcriptional modifications
  • To enable translation of mRNA

3. What are the plasmodesmata?

  • Cytoplasmic channels to enable cell to cell communication between plant cells
  • Cytoplasmic channels to enable cell to cell communication between animal cells
  • Pores in the cell membrane of the plant cell
  • Channels which water travel through in the plant cells

4. What is the purpose of the centriole

  • Acts as a track way for organelle transport
  • To reinforce the cell's shape
  • To initiate microtubules and organise spindle fibres
  • To make spindle fibres

5. Why do cells and organelles have different compartments? 1. to sequester toxic substances 2. To simplify the metabolic system 3. to maintain different environments in different parts in the cell 4. to enable them to produce toxins

  • 4 only is correct
  • 1, 2 and 3 are correct
  • 2 and 4 only are correct
  • 1 and 3 only are correct

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