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5 Written questions

5 Matching questions

  1. Two types of transport proteins
  2. Membranes at Work 2. Kidney Dialysis
  3. Transport Across Cell Membranes: Concentration Gradient
  4. Three Types of Passive Transport: 1. Diffusion
  5. Receptor - mediated endocytosi
  1. a 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
  2. b receptors, like antennae, detect specific compounds or cells and bind with them, triggering endocytosis.
  3. c 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. d filters toxic wastes that accumulate in the blood while retaining necessary proteins, glucose, amino acids & ions
  5. e 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

5 Multiple choice questions

  1. ...
  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. Know and be able to label a phospholipid bilayer diagram
  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. a cell membrane prevents many materials from entering the cell.

5 True/False questions

  1. Isotonic solutionhas 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


  2. Turgor pressureThe cell wall of a plant resists the pressure of a water-filled vacuole keeping the plant firm


  3. Bulk Transportthe 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.


  4. Particle Model of Matterall matter is made of tiny particles


  5. 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.