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5 Written Questions

5 Matching Questions

  1. Receptor - mediated endocytosi
  2. Transport Across Cell Membranes: Equilibrium
  3. Membranes at Work 2. Kidney Dialysis
  4. Transport Across Cell Membranes: Selective Transport
  5. Two types of Endocytosis:
  1. a a state at which molecules are evenly distributed (the concentration is equal throughout the medium)
    - molecules continue moving but equilibrium is maintained
  2. b a) phagocytosis - when cells "eat" by taking in large particles or other cells
    b) pinocytosis - when cells "drink" by taking in droplets of fluid
  3. c filters toxic wastes that accumulate in the blood while retaining necessary proteins, glucose, amino acids & ions
  4. d the movement of only certain substances across the cell membrane
  5. e receptors, like antennae, detect specific compounds or cells and bind with them, triggering endocytosis.

5 Multiple Choice Questions

  1. 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
  2. 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
  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. have 3-D shapes that make them highly selective, recognizing atoms or molecules by shape, size or charge.
  5. when the lysosome bursts and releases it's digestive enzymes into the cell resulting in cell destruction

5 True/False Questions

  1. 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


  2. Types of Transport Across Membranes: Passive Transportthe movement of only certain substances across the cell membrane


  3. The Fluid-Mosaic ModelCell membrane molecules are in constant motion (drifting past each other) resulting in:
    a) membrane flexibility
    b) cell's ability to change shape


  4. Three Types of Passive Transport 2.Osmosisthe diffusion of water molecules across a membrane (water molecules move from where they are more highly concentrated to where they are less concentrated)


  5. PlasmolysisLoss of water in a plant cell resulting in WILTING


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