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5 Written questions

5 Matching questions

  1. Brownian Motion
  2. Two types of transport proteins
  3. Membranes at Work 1.Water Purification: Reverse osmosis
  4. Cell Membrane Function: A Biological Barrier
  5. Membranes at Work 3. Controlled Delivery of Medications
  1. a medication can be placed in a flat transdermal patch that sticks to the skin. A semi-permeable membrane lining the inner surface allows drugs to diffuse out of the patch at a slow, constant rate.
  2. b in a liquid or gas, particles are in constant, random motion
  3. c a cell membrane prevents many materials from entering the cell.
  4. d a) 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. e 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

5 Multiple choice questions

  1. when the lysosome bursts and releases it's digestive enzymes into the cell resulting in cell destruction
  2. a state at which molecules are evenly distributed (the concentration is equal throughout the medium)
    - molecules continue moving but equilibrium is maintained
  3. 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
  4. 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
  5. movement across cell membranes without an input of energy
    2 reasons molecules move.
    1. Brownian Motion
    2. Concentration gradients

5 True/False questions

  1. Phospholipid bilayerLoss of water in a plant cell resulting in WILTING


  2. 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)


  3. ENDOCYTOSISthe 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. Transport Across Cell Membranes: Concentration Gradientthe movement of only certain substances across the cell membrane


  5. Active Transportthe use of vesicles to facilitate movement of substances that are too large to enter or exit the cell via transport proteins


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