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A student performed an experiment with bags of dialysis tubing filled with distilled water to model the process of osmosis. Dialysis tubing is a semi-permeable membrane that allows some materials to passively move through the tubing. The dialysis tubing bags were massed on a balance and then placed in beakers with solutions of sucrose of various concentrations, ranging from 0M to 1.0M sucrose. Select which question the experimental design is best addressing?

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KerryM

Question options:

  • How do hypotonic solutions prevent cells from surviving?
  • How do freshwater organisms maintain homeostasis when placed into a hypertonic condition?
  • How does the effect of environmental sucrose concentrations impact the  movement of water across a membrane?
  • How does the temperature in which bags of dialysis tubing are placed  directly impact the exchange of materials across the membrane?

Answer:

How does the effect of environmental sucrose concentrations impact the  movement of water across a membrane?

Explanation:

The student is modelling osmosis using dialysis tubing, which represents a semipermeable membrane, much like the plasma membrane. During osmosis, water moves from a high concentration to a lower concentration across a semipermeable membrane. Therefore, when the dialysis bag is placed in high concentrations of sucrose, water will move out of the bag by osmosis.

The experiment does not deal with cells or organisms, so the first two options cannot be correct, and temperature is not assessed in the experiment. Therefore, the answer is "How does the effect of environmental sucrose concentrations impact the  movement of water across a membrane? "

hasinarian

Answer:

C- How does the effect of environmental sucrose concentrations impact the movement of water across a membrane?

Explanation:

The variable in this experiment is the sucrose solutions (independent) and the change in mass of the dialysis bags (dependent). Therefore, the best question to be asked is how does the sucrose concentrations impact the change in mass due to water moving across the membrane.

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