Cell Membranes

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

1. 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
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2. Which of these is not correct?

  • Anaphase- Centromeres split and the chromatids move to the poles of the cell
  • Cytokinesis - Cytoplasm spilts to make two genetically different cells
  • Telophase - Chromatids have reached the poles, nuclear envelope reforms and chromosomes begin to unravel
  • Metaphase -Chromosomes line up at equator of cell, with the spindle attached at the centromere
  • Prophase - Supercoiling of chromosomes, nuclear envelope breakdown, spindle forms

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

  • Turgid and Plasmolysed
  • Lysis and Crentation

4. What are glycoprotiens used for?

  • Channel proteins allow larger molecules and ions through, carrier proteins actively transport things in and out of the cell
  • have a carbohydrate attached and is used for cell signaling, adhesion and cell surface antigens
  • Maintains the stability and fluidity of the bi-layer when the temperature fluctuates

5. What is diffusion?

  • Net movement of molecules from an area of high concentration to an area of low concentration
  • 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
  • Movement of ion across membranes through protein pumps that use ATP to move within the mebrane

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