Post 6 Individual

  1. Dialysis membrane is used to separate large molecules from small molecules, and is thus involves "active transport". TRUE / FALSE

  2. 10% solute on one side of membrane and 20% solute on other side: which way is net movement of water
    1. from 10% to 20%
    2. no net movement
    3. from 20% to 10%
    4. from lower water concentration to higher water concentration

  3. Molecules under 1,000 amu are able to penetrate the pores in the cellophane dialysis membranes. Despite what many lab manuals say about the impermiability of sucrose (342 amu) as the hypertonicity agent, we substituted PEG (poly-ethylene glycol; ≥10,000 amu). We had also added NaCl (23 and 35 amu), methylene blue (≈sucrose), and salivary α-amylase to the dialysis sausage. A dilute starch solution was in the exterior solution. Which of the following happened?
    1. the methylene blue was slow to move from the interior to the external solution, yet it moved.
    2. the starch entered the interior, was digested and the resulting glucose exitted to the external solution.
    3. the volume of the "sausage" decreased with time
    4. the chloride moved to the exterior of the "sausage"
    5. the α-amylase diffused out of the "sausage"
    6. the silver nitrate (AgNO3) moved into the "sausage"
    7. the interior of the "sausage" was initially hypertonic while the exterior was initially isotonic

  4. What to do to convert limp celery to crispy?
    1. put in refrigerator
    2. set in water
    3. warm it in the oven
    4. remove the air
    5. add lemon juice

  5. Why don't plants undergo [explosive] osmotic lysis (plasmolysis)?
    1. osmosis is part of animal life but not plant life
    2. cell walls prevent further expansion and bursting
    3. plant membranes prevent it

  6. What happened in the sequence of diagrams shown?
    1. The process is:
      1. heterolysis
      2. homolysis
      3. ismolysis
      4. plasmolysis
      5. plasmoptosis

    2. water moves ___ the cell
      1. into
      2. out of
      3. neither
    3. at the moment of putting the cell into a 20% NaCl solution, the cell was ___ relative to the 20% NaCl:
      1. hypertonic
      2. hypotonic
      3. isotonic
      4. metatonic
      5. catatonic

  7. Diffusion vs. osmosis (circle ALL which apply):
    1. diffusion deals with water only
    2. osmosis deals with water only
    3. diffusion is only across membranes
    4. osmosis is only across membranes

  8. Higher amounts of fertilizer (over-fertilization) wilts or kills plants because...
    1. unbalance the plant's sodium/potassium ratio
    2. contain too much phosphoric acid leading to too much acidity
    3. and moisture lead to a hypertonic solution which pulls water out of the plant.

  9. Lysis* means:
    1. alkaline or basic (as in too much lye)
    2. disruption or disintegration or taking apart
    3. tying things together (as in ligation)
    4. the disease of having a tendency for excessive prevarication - lying

  10. Persons severely dehydrated (e.g.: 3 days without water in a hot desert) are advised to imbibe water slowly rather than eagerly swallow a gallon so as to prevent:
    1. water intoxication
    2. pneumonia
    3. hemolysis
    4. hyperurea
    5. swollen ankles and feet
    6. diarrhea

* also as in analysis, hydrolysis