Cell Membranes

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

1. Which of these is not correct?

  • Anaphase- Centromeres split and the chromatids move to the poles of the cell
  • Prophase - Supercoiling of chromosomes, nuclear envelope breakdown, spindle forms
  • 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
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2. What is not part of the Fluid Mosaic model?

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

3. What is facilitated diffusion?

  • Movement of ion across membranes through protein pumps that use ATP to move within the mebrane
  • Channel proteins provide pathways for charged molecules or those that are too big,
  • Net movement of water from high water potential to low water potential
  • Vesicles moving large amount of substance in and out of the cell via ATP

4. Which of these statements are true?

  • Yeast uses mitosis to bud and make a new organism
  • Meiosis produces genetically different cells
  • Stem cells are undifferentiated cells that are not capable to differentiating into a number of different types of cells
  • Homologous chromosomes are chromosomes that don't have different versions of a gene at the same locus

5. What happens to a plann cell in high and low Ψ ?

  • Turgid and Plasmolysed
  • Lysis and Crentation

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