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5 Written questions

5 Matching questions

  1. Receptor - mediated endocytosi
  2. Differentiate between a Vacuole & Vesicle.
  3. The activities of a living cell depend on the ability of its membrane to
  4. Transport Across Cell Membranes: Selective Transport
  5. Cell Membrane Function: 6 materials a membrane prevents from entering the cell
  1. a Vesicle transports contents
    Vacuole stores the ingested material
  2. b receptors, like antennae, detect specific compounds or cells and bind with them, triggering endocytosis.
  3. c 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
  4. d the movement of only certain substances across the cell membrane
  5. e - salts - atoms - viruses
    - sugar - ions - bacteria
    - proteins (7? this is what was in the notes)
    most organelles are surrounded by membranes with the same structure as a cell membrane

5 Multiple choice questions

  1. Integral proteins extend through the entire bilayer and project from both surfaces
  2. 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
  3. when the lysosome bursts and releases it's digestive enzymes into the cell resulting in cell destruction
  4. The cell wall of a plant resists the pressure of a water-filled vacuole keeping the plant firm
  5. 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 True/False questions

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


  2. Two types of Endocytosis: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. Membranes at Work 1.Water Purification: Reverse osmosisuses 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


  4. Three Types of Passive Transport: 1. Diffusionthe diffusion of water molecules across a membrane (water molecules move from where they are more highly concentrated to where they are less concentrated)


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


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