Cell Membranes

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  • Created by: jenny
  • Created on: 22-05-16 14:30

1. Which of these is not correct?

  • Telophase - Chromatids have reached the poles, nuclear envelope reforms and chromosomes begin to unravel
  • Cytokinesis - Cytoplasm spilts to make two genetically different cells
  • Metaphase -Chromosomes line up at equator of cell, with the spindle attached at the centromere
  • Anaphase- Centromeres split and the chromatids move to the poles of the cell
  • Prophase - Supercoiling of chromosomes, nuclear envelope breakdown, spindle forms
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2. What is not a function of the membrane?

  • Regulate transport in and out of cell
  • Membranes produce different compartments inside cells
  • Cell recognition and signalling (such as electrical signals)
  • Produce proteins for repair
  • Separate cell contents from the outside

3. How is exocytosis and endocytosis carried out?

  • Vesicles moving large amount of substance in and out of the cell via ATP
  • Channel proteins provide pathways for charged molecules or those that are too big,

4. What is diffusion?

  • Movement of ion across membranes through protein pumps that use ATP to move within the mebrane
  • Net movement of molecules from an area of high concentration to an area of low concentration
  • Net movement of water from high water potential to low water potential
  • Channel proteins provide pathways for charged molecules or those that are too big,

5. What is not part of the Fluid Mosaic model?

  • Constantly moving and diffrent shapes
  • Used for cell signalling
  • 7-10nm thick
  • Proteins
  • Phosopholipid bilayer
  • Cholesterol
  • Glycolipids


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