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5 Written questions

5 Matching questions

  1. Transport proteins
  2. Cell Membrane Function: A Biological Barrier
  3. Protein position within a membrane:
    Integral proteins
  4. Cell Membrane Structure
  5. Particle Model of Matter
  1. a a cell membrane prevents many materials from entering the cell.
  2. b Know and be able to label a phospholipid bilayer diagram
  3. c Integral proteins extend through the entire bilayer and project from both surfaces
  4. d all matter is made of tiny particles
  5. e have 3-D shapes that make them highly selective, recognizing atoms or molecules by shape, size or charge.

5 Multiple choice questions

  1. 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
  2. the 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
  3. - 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
  4. diffusion of molecules across the cell membrane by way of transport proteins.
  5. the difference in concentration between two areas for any given molecule produces a gradient or path of movement in which molecules move toward areas where the concentration of particles is lower
    - molecules move down a concentration gradient

5 True/False questions

  1. Differentiate between a Vacuole & Vesicle.Vesicle transports contents
    Vacuole stores the ingested material

          

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

          

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

          

  4. Brownian Motionin a liquid or gas, particles are in constant, random motion

          

  5. EXOCYTOSISthe reverse of endocytosis, whereby the membrane of vesicles or vacuoles fuses with the cell membrane and the stored contents are expelled from the cell.

          

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