Osmosis Retake

If you soak your hands in dishwater, you may notice that your skin absorbs water and swells into wrinkles. This is because your skin cells are _______________ to the _______________ dishwater.

• Hypotonic…hypertonic

• Hypertonic…hypotonic

• Hypotonic…hypotonic

• Isotonic…hypotonic

• Hypertonic…isotonic

You decide to buy a new fish for your freshwater aquarium. When you introduce the fish into its new tank, the fish swells up and dies. You later learn that it was a fish from the ocean. Based on what you know of tonicity, the most likely explanation is that the unfortunate fish went from a(n) _______________ solution (one that it was used to) into a(n) _______________ solution.

• isotonic, hypotonic

• hypertonic, isotonic

• hypotonic, hypertonic

• hypotonic, isotonic

• isotonic, hypertonic

In osmosis, water always moves toward the ____ solution: that is, toward the solution with the ____ solute concentration.

• isotonic, greater

• hypertonic, greater

• hypertonic, lesser

• hypotonic, greater

• hypotonic, lesser

The concentration of solutes in a red blood cell is about 2%. Sucrose cannot pass through the membrane, but water can. Osmosis would cause red blood cells to shrink the most when immersed in which of the following solutions?

• a hypertonic sucrose solution

• a hypotonic sucrose solution

• pure water

Sea water is dangerous to drink because

• one cup of sea water contains enough sodium to poison you.

• sea water is hypertonic to your body tissues and drinking it will cause you to lose water.

• sea water is isotonic to your body fluids and you will absorb too much water.

• the salt causes hypertension and you will promptly die of a stroke.

• it contains toxic levels of iodine.

If the volume of a cell increases when it is placed in a solution, that solution is said to be __________ to the cell.

• hypertonic

• subatomic

• isotonic

• hypotonic

Inside one osmosis bag*, A, is a 50% glucose solution and inside bag B is a 20% glucose solution. Both bags are put into beakers containing 100% water.

*Osmosis bags are membranes that let water through but not glucose.

• Bag A will gain weight.

• Bag B will gain weight.

• Both bags will gain weight.

• Both bags will lose weight.

• Both bags will remain the same.

A 0.9% NaCl solution is isotonic to red blood cells. Which of these describes the results if red blood cells are placed into a 1.0% solution of NaCl?

• They will burst.

• They will shrink.

• Nothing will happen.

• They will expand but not burst.

• None of the above.

Wallway is a new general herbicide for aquatic plants. Its main ingredient is a marine salt solution. It is effective against freshwater but not saltwater plants. It works by breaking down the cell walls of the plants. The freshwater plants die because their cells

• swell and cease to function

• shrink

• remain the same size but malfunction

• are crushed by the weight of the plant

A red blood cell has a salt concentration of 0.9%. What will happen if it is placed into a 1% salt solution? The red blood cell will

• shrink if its membrane is permeable to both the salt and the water.

• shrink if its membrane is impermeable to the salt and permeable to the water.

• maintain its shape - nothing will happen.

• swell and probably burst because its membrane is impermeable to salt and permeable to water.

• swell and probably burst because its membrane is impermeable to water and permeable to salt.