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5 Written questions

5 Matching questions

  1. Transport Across Cell Membranes: Concentration Gradient
  2. The activities of a living cell depend on the ability of its membrane to
  3. Protein position within a membrane:
    Peripheral proteins
  4. Types of Transport Across Membranes: Passive Transport
  5. Phospholipid bilayer
  1. a Peripheral proteins are partially embedded in the inside or outside surface of the membrane
  2. b 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
  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 each phospholipid molecule has a head that is hydrophilic (water-loving) and two tails that are hydrophobic (water-fearing)
  5. e movement across cell membranes without an input of energy
    2 reasons molecules move.
    1. Brownian Motion
    2. Concentration gradients

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. the diffusion of water molecules across a membrane (water molecules move from where they are more highly concentrated to where they are less concentrated)
  3. Loss of water in a plant cell resulting in WILTING
  4. a) phagocytosis - when cells "eat" by taking in large particles or other cells
    b) pinocytosis - when cells "drink" by taking in droplets of fluid
  5. filters toxic wastes that accumulate in the blood while retaining necessary proteins, glucose, amino acids & ions

5 True/False questions

  1. 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

          

  2. Proteins in membranes serving the following functionsa) 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

          

  3. Three Types of Passive Transport 3.Facilitated Diffusiondiffusion of molecules across the cell membrane by way of transport proteins.

          

  4. Transport Across Cell Membranes: Selective Transportthe 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

          

  5. 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)