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?

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

3. What effect does heat not have on the plasma membrane?

  • Channel proteins start to denature leaving big gaps in the cell membrane
  • Molecules vibrate less so less molecules come through
  • Molecules vibrate more, leaving temporary gaps in the phospholipid bilayer

4. What is cell signalling not used for?

  • Drugs like beta- blockers or aspirin will bind to certain receptors on cells
  • Some drugs that treat depression like diazepan mimic a neurotransmitter
  • Movement of molecules from an area of high concentration to low
  • Hormones will attach to a receptor of target cells and internal response is triggered

5. What is facilitated diffusion?

  • Vesicles moving large amount of substance in and out of the cell via ATP
  • 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,
  • Movement of ion across membranes through protein pumps that use ATP to move within the mebrane

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