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5 Written questions

5 Matching questions

  1. Protein position within a membrane:
    Integral proteins
  2. Cell Membrane Function: A Selective Filter
  3. Transport Across Cell Membranes: Concentration Gradient
  4. The activities of a living cell depend on the ability of its membrane to
  5. Transport Across Cell Membranes: Equilibrium
  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 Integral proteins extend through the entire bilayer and project from both surfaces
  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 Cell 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. e 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

5 Multiple choice questions

  1. the diffusion of water molecules across a membrane (water molecules move from where they are more highly concentrated to where they are less concentrated)
  2. - 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
  3. diffusion of molecules across the cell membrane by way of transport proteins.
  4. 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. receptors, like antennae, detect specific compounds or cells and bind with them, triggering endocytosis.

5 True/False questions

  1. Cell Membrane Structurethe use of vesicles to facilitate movement of substances that are too large to enter or exit the cell via transport proteins

          

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

          

  3. Membranes at Work 3. Controlled Delivery of Medicationsfilters toxic wastes that accumulate in the blood while retaining necessary proteins, glucose, amino acids & ions

          

  4. Two types of transport proteinsa) 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. 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