Cell Transport Review

The diagram to the right shows the same type of molecule on side A and side B.  According to diffusion, which direction will the molecules move?

• Molecules move towards B until equilibrium is reached
• Molecules move towards A
• Molecules won’t move
• All of the molecules will explode

Placing wilted cabbage  in cold water will make it crisp again. Which statement best describes what happens to restore the cabbage to its original condition?

•  Water left the cabbage cells by diffusion
• Water entered the cells of the cabbage by osmosis
• Osmosis caused salts to enter the cabbage cells.
• Salts in the cabbage leaf caused water to leave the cells.

You are conducting osmosis experiments with a test tube of human cells in solution.  You pour table salt into the test tube.  According to the principles of osmosis, what can you predict will happen to the cells? 

• They will swell and burst
• They will not be affected.
• They will shrink and shrivel.
• They will undergo rapid mitosis.

A person with swollen gums rinses his mouth with warm salt water, and the swelling decreases. Which has occurred?

• The swollen gums have absorbed the saltwater solution
• The saltwater solution lowers the temperature of the water in the gums
• The salt in the solution has moved against the concentration gradient
• The water in the gums has moved from a high to a low concentration of water.

Which is an example of osmosis?

• potassium ions moving in and out of an animal cell
• carbon dioxide moving into the leaf cells of a plant
• oxygen moving into the bloodstream from the lungs
• water moving into the root cells of a plant

A freshwater plant is placed in a container of saltwater. What will most likely happen to the cells of the plant?

• They will swell because water will move into them
• They will swell because salt will move into them.
• They will shrink because water will move out of them.
• They will shrink because salt will move out of them

According to the diagram, which statement best describes the general direction of diffusion across the membrane of this cell?  This cell membrane is permeable to all materials..

• Oxygen would diffuse into the cell.
• Carbon dioxide would diffuse out of the cell.
• Glucose would diffuse into the cell
• Protein would diffuse out of the cell.

According to the diagram above, which direction would glucose move?  This cell membrane is permeable to everything...

• Glucose would diffuse into the cell via diffusion.
• Glucose would diffuse out of the cell via diffusion
• Glucose would dissolve
• Glucose would combine with carbon dioxide.

If energy is needed to move materials into or out of a cell, what is most likely occurring?A  B  C  D 

• active transport
• passive transport
• osmosis
• diffusion

Which would be the best evidence that a cell is using active transport to move a substance across its cell membrane?

• Substances are moving rapidly across the cell membrane
• ATP is being rapidly consumed near the cellular membrane.
• Substances are moving from high to low concentrations
• Substances are moving through channels in the cell membrane.