Cell Organelles

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1. What are microtubules?

  • A component of the cytoskeleton that forms a scaffold like structure that determines the shape of the cell
  • A component of the cytoskeleton that can break down the cell and rebuild it again during complex cellular processes
  • Contractile fibres formed from the protein actin
  • Tiny organelles on the surface of the cell that record information about the cells environment
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2. During transcription, why is information from DNA copied onto RNA?

  • RNA would be wasted if it wasn't used
  • DNA cannot obtain enough energy to properly deliver information to the other organelles and so it passes info onto RNA, which can gain enough energy to transfer the info
  • DNA is too large to leave the nucleus so its information is copied onto RNA which is small enough to leave through the nuclear pores
  • DNA is too important to leave the nucleus so RNA acts as a messenger delivering information to other organelles within the cell

3. Where are proteins synthesised?

  • On the ribosomes bound to the endoplasmic reticulum
  • Within the endoplasmic reticulim
  • In the ribosomes that are found free floating in the cytoplasm
  • In the cisternae of the golgi apparatus

4. In prokaryotic cells, the cell wall is made from...?

  • Peptidoglycan
  • Ribosomes
  • Cellulose
  • Starch

5. How is the size of ribosomes in prokaryotic cells determined?

  • Its determined by the rate in which they settle or form a sedimate in solution
  • Its random
  • Its determined by the size of the cell
  • Its determined by how many ribosomes are present


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