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5 Written questions

5 Matching questions

  1. Cell Membrane Structure
  2. Protein position within a membrane:
    Integral proteins
  3. Receptor - mediated endocytosi
  4. Protein position within a membrane:
    Peripheral proteins
  5. Cell Membrane Function: 6 materials a membrane prevents from entering the cell
  1. a Know and be able to label a phospholipid bilayer diagram
  2. b - salts - atoms - viruses
    - sugar - ions - bacteria
    - proteins (7? this is what was in the notes)
    most organelles are surrounded by membranes with the same structure as a cell membrane
  3. c Integral proteins extend through the entire bilayer and project from both surfaces
  4. d Peripheral proteins are partially embedded in the inside or outside surface of the membrane
  5. e receptors, like antennae, detect specific compounds or cells and bind with them, triggering endocytosis.

5 Multiple choice questions

  1. has the same solute concentration on both sides of the cell membrane. Equilibrium has been reached. EQUAL FLOW of water into and out of the cell
  2. Loss of water in a plant cell resulting in WILTING
  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. 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. have 3-D shapes that make them highly selective, recognizing atoms or molecules by shape, size or charge.

5 True/False questions

  1. EXOCYTOSISthe cell membrane forms a pocket around the material to be transported, then either pinches off as a vesicle or a vacuole.


  2. Cell Membrane Function: A Biological BarrierCell 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. Membranes at Work 2. Kidney Dialysisfilters toxic wastes that accumulate in the blood while retaining necessary proteins, glucose, amino acids & ions


  4. Three Types of Passive Transport: 1. Diffusionthe net movement of particles from an area of high concentration to an area of low concentration
    - no energy is expended
    - in a cell very small particles can cross the cell membrane by moving between the phospholipid molecules


  5. The activities of a living cell depend on the ability of its membrane to1. transport raw materials into the cell (and out of)
    2. transport manufactured products and wastes out of the cell
    3. prevent unwanted matter from entering the cell
    4. prevent the escape of matter needed to perform cellular functions