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During Osmosis Individual Molecules Move Quiz Answers

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Sandra Watson
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Q1.  During osmosis, individual molecules move:

Toward lower concentrations

Toward lower osmotic pressure

All directions with equal probability

Toward higher concentrations

Q2. When the Sim Cell membrane in the Cell-O-Scope simulator jiggled back and forth, this was due to:

Pressure against the membrane

Osmosis causing molecules to flow across the membrane

The membrane not being at equilibrium

None of the above

Q3. Placing blood cells into a solution that is hypertonic to the cells will cause the osmotic pressure of the cells to:

Increase

Decrease

Neither increase nor decrease

Q4. Placing blood cells into a solution that is isotonic to the cells will cause the osmotic pressure of the cells to:

Increase

Decrease

Neither increase nor decrease

Q5. According to the rules of osmosis, a system will reach a state of equilibrium when there are equal numbers of ______ molecules on both sides of a water-permeable membrane.

solute

solvent

water

none of the above

Q6. A SimCell with a water-permeable membrane that contains 20 hemoglobin molecules and 480 water molecules is placed into an extracellular fluid that contains 20 dextrose molecules and 480 water molecules. Which of the following should happen?

More water molecules will flow from the SimCell into the extracellular fluid than from the extracellular fluid into the SimCell.

More water molecules will flow from the extracellular fluid into the SimCell than from the SimCell into the extracellular fluid.

There will be no movement of water molecules across the membrane.

Water molecules will move back and forth equally across the membrane.

Q7. A SimCell with a water-permeable membrane that contains 20 hemoglobin molecules and 480 water molecules is placed in an extracellular fluid that contains 40 dextrose molecules and 960 water molecules. Which of the following should happen?

More water molecules will flow from the SimCell into the extracellular fluid than from the extracellular fluid into the SimCell.

More water molecules will flow from the extracellular fluid into the SimCell than from the SimCell into the extracellular fluid.

There will be no movement of water molecules across the membrane.

Water molecules will move back and forth equally across the membrane.

Q8.  A SimCell with a water-permeable membrane that contains 50 dextrose molecules, 25 glucose molecules, 25 hemoglobin molecules and 900 water molecules is placed in an extracellular fluid that is one part solute to 15 parts water (its solute-to-solvent ratio is 1:15). Which of the following should happen?

More water molecules will flow from the SimCell into the extracellular fluid than from the extracellular fluid into the SimCell.

More water molecules will flow from the extracellular fluid into the SimCell than from the SimCell into the extracellular fluid.

There will be no movement of water molecules across the membrane.

Water molecules will move back and forth equally across the memb

Q9  A SimCell has a special membrane that is permeable to alcohol but not to water. This SimCell contains 20% alcohol and 80% water and is placed in a solution containing 40% alcohol and 60% water. What will happen to the cell?

It will expand due to net movement of water into the cell.

It will expand due to net movement of alcohol into the cell.

It will contract due to net movement of water out of the cell.

It will contract due to net movement of alcohol out of the cell.

Q10. Fish that live in saltwater and fish that live in freshwater both have water balance challenges that deal with osmosis. What is the best characterization of the challenges for each, based on your investigations in this lab?

Both types of fish must constantly get rid of excess water.

Freshwater fish must get rid of excess water and saltwater fish must retain the water they have.

Freshwater fish must retain the water they have and saltwater fish must get rid of excess water.

Both kinds of fish must retain as much water as they can.

 

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During Osmosis Individual Molecules Move

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