Biology | Semester 2 | Tonicity Practice | Study Guide

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

Both bags will gain weight

Flasks X, Y, and Z contain solutions with different concentrations of the solute NaCl. Flask X has a 0.5% NaCl Flask Y has a 0.9% NaCl Flask Z has a 1.5 % NaCl Red blood cells (0.9% NaCl) will be placed into each flask. Predict what will happen to the blood cells in each of the flasks. Flask X _ Flask Y _ Flask Z _ Flasks X, Y, and Z contain solutions with different concentrations of the solute NaCl. Flask X has a 0.5% NaCl Flask Y has a 0.9% NaCl Flask Z has a 1.5 % NaCl

Flask X - Swell Flask Y - Uncharged Flask Z - Contract

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

Hypotonic

You decide to bu a new fish for your freshwater aquarium. When you introdice the fish into its new tank, the fish swells up and dies. You return to the pet store only to find out that the fish was from the ocean and was mislabeled. Based on what you know of tonicity, the most likely explanation is that the unfortunate fish went from a(n) _ solution into a(n) _ solution. You decide to bu a new fish for your freshwater aquarium. When you introdice the fish into its new tank, the fish swells up and dies. You return to the pet store only to find out that the fish was from the ocean and was mislabeled. Based on what you know of tonicity, the most likely explanation is that the unfortunate fish went from a(n)

Isotonic....hypotonic

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 9% solution of NaCl.

Nothing will happen

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

Shrink

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

The blood cell will shrink if its membrane is impermeable to the salt and permeable to the water.

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

a hypertonic sucrose solution

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

hypertonic...greater

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.

hypertonic...hypotonic

Sea water is dangerous to drink because:

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