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5 Written Questions

5 Matching Questions

  1. Two types of Endocytosis:
  2. Membranes at Work 1.Water Purification: Reverse osmosis
  3. EXOCYTOSIS
  4. Transport Across Cell Membranes: Equilibrium
  5. Transport Across Cell Membranes: Concentration Gradient
  1. a a) phagocytosis - when cells "eat" by taking in large particles or other cells
    b) pinocytosis - when cells "drink" by taking in droplets of fluid
  2. b 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
  3. c 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
  4. d 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.
  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. 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. 1. 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
  3. 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
  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. each phospholipid molecule has a head that is hydrophilic (water-loving) and two tails that are hydrophobic (water-fearing)

5 True/False Questions

  1. Membranes at Work 2. Kidney Dialysishave 3-D shapes that make them highly selective, recognizing atoms or molecules by shape, size or charge.

          

  2. The Fluid-Mosaic Modelthe 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. Differentiate between a Vacuole & Vesicle....

          

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