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5 Written questions

5 Matching questions

  1. The Fluid-Mosaic Model
  3. Cell Membrane Function: A Selective Filter
  4. Transport proteins
  5. Isotonic solution
  1. a the cell membrane forms a pocket around the material to be transported, then either pinches off as a vesicle or a vacuole.
  2. b have 3-D shapes that make them highly selective, recognizing atoms or molecules by shape, size or charge.
  3. c 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
  4. d Cell 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)
  5. e Cell membrane molecules are in constant motion (drifting past each other) resulting in:
    a) membrane flexibility
    b) cell's ability to change shape

5 Multiple choice questions

  1. Peripheral proteins are partially embedded in the inside or outside surface of the membrane
  2. each phospholipid molecule has a head that is hydrophilic (water-loving) and two tails that are hydrophobic (water-fearing)
  3. the reverse of endocytosis, whereby the membrane of vesicles or vacuoles fuses with the cell membrane and the stored contents are expelled from the cell.
  4. when the lysosome bursts and releases it's digestive enzymes into the cell resulting in cell destruction
  5. a) phagocytosis - when cells "eat" by taking in large particles or other cells
    b) pinocytosis - when cells "drink" by taking in droplets of fluid

5 True/False questions

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


  2. Turgor pressureThe cell wall of a plant resists the pressure of a water-filled vacuole keeping the plant firm


  3. Types of Transport Across Membranes: Passive Transportmovement across cell membranes without an input of energy
    2 reasons molecules move.
    1. Brownian Motion
    2. Concentration gradients


  4. Two types of transport proteinsa) carrier proteins - facilitate the diffusion of glucose across the cell membrane
    b) channel proteins - have tunnel-like pores filled with water that allow charged ions in and out of the cell


  5. Cell Membrane StructureKnow and be able to label a phospholipid bilayer diagram


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