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5 Written questions

5 Matching questions

  1. Transport Across Cell Membranes: Equilibrium
  2. Receptor - mediated endocytosi
  3. Bulk Transport
  4. Hypertonic solution
  5. Types of Transport Across Membranes: Passive Transport
  1. a the use of vesicles to facilitate movement of substances that are too large to enter or exit the cell via transport proteins
  2. b movement across cell membranes without an input of energy
    2 reasons molecules move.
    1. Brownian Motion
    2. Concentration gradients
  3. c receptors, like antennae, detect specific compounds or cells and bind with them, triggering endocytosis.
  4. d has a higher concentration of solute compared to the inside of the cell
  5. e a state at which molecules are evenly distributed (the concentration is equal throughout the medium)
    - molecules continue moving but equilibrium is maintained

5 Multiple choice questions

  1. in a liquid or gas, particles are in constant, random motion
  2. The cell wall of a plant resists the pressure of a water-filled vacuole keeping the plant firm
  3. when the lysosome bursts and releases it's digestive enzymes into the cell resulting in cell destruction
  4. each phospholipid molecule has a head that is hydrophilic (water-loving) and two tails that are hydrophobic (water-fearing)
  5. 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 True/False questions

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


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


  3. Three Types of Passive Transport 3.Facilitated 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


  4. Cell Membrane Function: A Selective FilterCell 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. 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.