Macromolucule review & Diffusion lab

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Macromolucule review & Diffusion lab
2012-10-15 17:13:01
BI 253

10-16 Lab
Show Answers:

  1. What reagent is used to test for for mono- & disaccharides?
    Benedict's Reagent
  2. What happens to Benedict's reagent in the presence of simple sugars?
    It forms a yellow, orange, green or red precipitate
  3. What reagent is used to test for starch?
    Iodine reagent
  4. What happens to iodine reagent in the presence of starch?
    The solution turns dark blue
  5. ___ ___ is used to test for proteins.
    Biuret Reagent
  6. Biuret reagent starts blue and then changes to what in the presence of proteins?
    Lavender or light violet
  7. Starch is a polysaccharide that. . . .
    Is made up of only glucose subunits
  8. Animals store glucose in ___ which is another form of polysaccharide.
  9. ___ is the most abundant carb in the world & makes up the ___ ___ of ___.
    • Cellulose
    • Cell Walls of plants
  10. How do we perform chemical hydrolysis in the lab?
    By heating molecules with acid in the presence of water
  11. What is an emulsion?
    Mix of proteins, carbs & lipids where the lipids occur in very small droplets dispersed throughout the water soluble portion
  12. Describe the process of clarification.
    Process used to separate lipids fr water-soluble protein containing part of a substance
  13. A plasma membrane allowing water to pass freely through but regulating mvmt of solvents is called ___ ___.
    Selective Permeability
  14. Water is a universal dissolving agent making it the ____ in a solution.
  15. The substances that are dissolved in a solution are the ____.
  16. What is the physical process where molecules move fr an area of high concentration to an area of low?
  17. What is osmosis?
    Diffusion of water thru selectively permeable membrane fr area of high concentration to an area of lower concentration.
  18. Solutes that cannot cross a membrane are called ___ ___.
    Nonpenetrating Solutes
  19. A hypertonic solution is one in which . . .
    Solute concentration is higher outside the cell than inside giving it a greater osmolarity
  20. A hypertonic solution causes water to . . .
    Flow out of the cell & eventually crenate
  21. A solution w/greater concentration of solute inside the cell (lower osmolarity) is called ____.
  22. A hypotonic solution cause water to . . .
    Flow into the cell and eventually lysis
  23. What is the term for solute concentration expressed in molarity?
  24. 2 solutions that are said to be in equilibrium are called ____.
  25. What form of energy drives diffusion?
    Intrinsic molecular kinetic energy
  26. When a protoplast, in a plant cell, shrinks & pulls away fr the cell wall due to being placed in a hypertonic solution ____ occurs.
  27. A plant cell exclusive of the cell wall is called a ____.
  28. When a plant cell is placed in hypotonic solution, water flows in expanding the protoplast against the cell wall causing what?
    Turgor Pressure
  29. What is water potential in plant cells?
    Combined force created by solute concentration & physical pressure
  30. A plant cell that has undergone plasmolysis is said to be ____.
  31. Lg particles suspended in water in motion is traditionally called ___ ___.
    Brownian Mvmt