Cell Transport

The data shows the percentage changes in the masses of two potato cubes of equal dimensions when placed in solutions of varying concentrations of solute.

What can be interpreted from the data?

• As solute concentration increases, more water enters the potato, increasing its mass.

• As solute concentration increases, more water leaves the potato, reducing its mass.

• As solute concentration decreases, more water enters the potato, reducing its mass.

• As solute concentration decreases, more water leaves the potato, increasing its mass.

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-3

Examine the model that shows a protein molecule’s function within the cellmembrane.

What function of the protein is demonstrated by the model?

• The protein transports a food molecule against the concentration gradient using energy.

• The protein transports a food molecule with the concentration gradient without using energy.

• The protein removes a toxin with the concentration gradient using energy.

• The protein removes a toxin against the concentration gradient without using energy.

The diagram shows a student’s model of the facilitated diffusion process.

The student plans to add a note about the process to the model. Which note should the student add?

• The process occurs along the concentration gradient using energy.

• The process occurs along the concentration gradient without using energy.

• The process occurs against the concentration gradient using energy.

• The process occurs against the concentration gradient without using energy.

What will be the most likely effect of placing a freshwater protozoan in a highly concentrated saltwater solution?

• The protozoan will burst.

• The protozoan will swell.

• The protozoan will shrink.

• The protozoan will be unaffected.

Tags

NGSS.HS-LS1-3

A student places a plant cell in a solution of unknown concentration for 15 minutes before observing the cell under a microscope. The image shows the student’sobservations.

Which statement correctly describes the concentration of the solution?

• The concentration of water in the solution is greater than the water concentration inside theplant cell.

• The concentration of water in the solution is equal to the water concentration inside the plant cell.

• The concentration of solute in the solution is greater than the solute concentration inside the plant cell.

• The concentration of solute in the solution is less than the solute concentration inside the plant cell.

How does osmosis differ from other cell transport processes?

• It moves water molecules by diffusion.

• It uses energy to move water molecules.

• It moves molecules using transport proteins.

• It moves molecules against the concentration gradient.