Membrane Transport Review

Which of the following is an example of active transport?

• osmosis

• diffusion

• facilitated diffusion

• endocytosis

Answer explanation

Endocytosis moves large molecules into the cell. It takes energy, therefore it is active transport.

In diffusion, molecules move from ​ (a)   to ​ (b)   concentration.

• high
• low

Answer explanation

Diffusion does not require energy; it moves downstream.

Tags

NGSS.HS-PS1-5

What separates facilitated diffusion from other types of diffusion?

• it uses transport proteins

• it requires phospholipids

• it goes from low to high concentration

• it requires energy

Answer explanation

Facilitated diffusion is the same as diffusion except it requires a transport protein.

What would happen to an animal cell in an isotonic solution?

• it will gain water and lyse

• it will lose water and shrivel

• it will gain and lose water equally

Answer explanation

In an isotonic solution solute concentration is equal.

Match the following types of transport to their descriptions:

• Osmosis

• Transport of large molecules out of the cell

• Facilitated diffusion

• Transport of large molecules into the cell

• Exocytosis

• Movement from high to low concentration

• Endocytosis

• Diffusion of Water

• Diffusion

• Diffusion with the help of a transport protein

What kind of solution would cause an animal cell to gain water and lyse?

• hypotonic

• hypertonic

• isotonic

Answer explanation

A hypotonic solution has fewer solutes than the solution. Therefore, water will move into the cell.

What kind of solution would cause a plant cell to lose water and go through plasmolysis?

• hypotonic

• hypertonic

• isotonic

Answer explanation

A hypertonic solution has more solutes than the solution. Therefore, water will move out of the cell.

The plant's cell wall causes plasmolysis to occur when water is lost.

Match the following terms to the correct descriptions:

• Solution

• the liquid

• Solute

• something in liquid (ex. salt)

• Solvent

• a liquid with something dissolved in it

What do you call a channel protein that allows water to pass through?

• water-mover

• aquaporin

• peptide

• sodium-potassium pump

Draw an arrow to show which way the water will move for each cell.

Answer explanation

Water will move toward the solutes.

In an isotonic solution, water moves in and out equally.

Tags

NGSS.MS-LS1-2