Unit 2 Test Review

What property of the cell membrane allows its to let certain substances enter the cell and keep certain substances out?

• Selective Permeability

• Transport Proteins

• Carbohydrate Chains

• Hydrophobic Phospholipid Tails

Which type of solution causes a cell to be in dynamic equilibrium?

• isotonic

• hypotonic

• hypertonic

Which types of solution causes water to LEAVE a cell?

• isotonic

• hypotonic

• hypertonic

If the inside of a cell has 90% water and the surrounding solution is 50% water, which way will the water move?

• Into the cell

• Out of the cell

• Both into and out of the cell

• The water will not move

Two solutions of sugar dissolved in water, 1 and 2, are separated by a selectively permeable membrane. Solution 1 is 10% glucose while solution 2 is 75% glucose. The membrane is not permeable to glucose. What is the name given to the process that will occur between these 2 solutions?

• Osmosis

• Diffusion

• Endocytosis

• Active Transport

Two solutions of sugar dissolved in water, 1 and 2, are separated by a selectively permeable membrane in a beaker. Solution 1 is 10% glucose while solution 2 is 75% glucose. The membrane is not permeable to glucose. In which way will the substances move within the beaker?

• Glucose will move across the membrane from solution 2 to solution 1.

• Water will move across the membrane from solution 1 to solution 2.

• Water will move across the membrane from solution 2 to solution 1.

• Water and glucose will move equally in both directions.

Plant cells normally contain 5% salt. In an experiment, a student placed a plant cell in solution A which contained 5% salt and 95% water. The student then placed a second plant cell in solution B which contained 10% salt and 90% water.

After leaving the cells to sit in each solution for 5 minutes, what do you think the student will most likely see?

• Salt has moved into the cell in Solution A.

• Salt has moved out of the cell in Solution B.

• Water has moved out of the cell in Solution A.

• Water has moved out of the cell in Solution B.

When a hurricane hits, typically the land nearest to the shore experiences flooding of ocean water. Scientists have discovered that the salt concentration in the flood water causes many land plants to die. What most likely is the cause of these plants dying?

• water moving into the plant cells

• water moving out of the plant cells

• both water and salt moving into the plant cells

• salt moving into the plant cell

True OR False: Facilitated diffusion requires the help of a protein to move substances from low to high concentrations.

• True

• False

Answer explanation

The ANSWER is FALSE. Although facilitated diffusion does use the help of protein to move substances across the membrane, it moves substances from HIGH to LOW concentrations, NOT low to high.

What process if shown in the image above?

• exocytosis

• endocytosis

• endoplasmolysis

• equilibrium