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5 Written questions

5 Matching questions

  1. Proteins in membranes serving the following functions
  2. Particle Model of Matter
  3. Membranes at Work 1.Water Purification: Reverse osmosis
  4. Membranes at Work 2. Kidney Dialysis
  5. Cell Membrane Function: A Biological Barrier
  1. a filters toxic wastes that accumulate in the blood while retaining necessary proteins, glucose, amino acids & ions
  2. b uses pressure to force contaminated water through a membrane with fine pores that will not allow bacteria, salts, and other dissolved molecules through, resulting in water with fewer impurities
  3. c all matter is made of tiny particles
  4. d a cell membrane prevents many materials from entering the cell.
  5. e a) moving substances across the membrane
    b) carrying out chemical reactions (they act as enzymes)
    c) some have "marker" molecules (carbohydrate chains) on their surface allowing cells to recognize each other
    d) allow messenger molecules (such as hormones) to attach
    e) assist in cell-to-cell communication and control of cell functions

5 Multiple choice questions

  1. when the lysosome bursts and releases it's digestive enzymes into the cell resulting in cell destruction
  2. Know and be able to label a phospholipid bilayer diagram
  3. Cell membrane molecules are in constant motion (drifting past each other) resulting in:
    a) membrane flexibility
    b) cell's ability to change shape
  4. ...
  5. the movement of molecules and ions against the concentration gradient which requires ATP energy and carrier proteins to pump these molecules from an area of low solute concentration to an area of high solute concentration.

5 True/False questions

  1. Hypotonic solution,has a lower concentration of solute compared to inside the cell


  2. Cell Membrane Function: 6 materials a membrane prevents from entering the cellCell membranes are semi-permeable allowing some materials to cross, while excluding others. They can select a) by particle size
    - small enough to enter membrane - O2 H2O
    - too large to cross - sugar
    b) particular materials to transport across (they bind to chemicals based on their size shape or charge)


  3. Protein position within a membrane:
    Peripheral proteins
    Integral proteins extend through the entire bilayer and project from both surfaces


  4. Transport Across Cell Membranes: Selective Transportthe movement of only certain substances across the cell membrane


  5. Transport Across Cell Membranes: Equilibriumthe movement of only certain substances across the cell membrane


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