Diffusion Through a Membrane Quiz

What is osmosis?

• The movement of water molecules from an area of low concentration to an area of high concentration through a selectively permeable membrane.

• The movement of water molecules from an area of high concentration to an area of low concentration through a selectively permeable membrane.

Explain the process of osmosis with an example.

• Osmosis is the movement of water from an area of low concentration to an area of high concentration.

• When a plant cell is placed in a hypertonic solution, water moves out of the cell causing it to shrink and wilt.

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NGSS.MS-LS1-2

What is the role of a selectively permeable membrane in diffusion?

• Controls the movement of substances in and out of the cell

• Only allows water to enter the cell

How does a selectively permeable membrane allow certain molecules to pass through?

• By attracting specific molecules with a magnetic force

• By controlling the size, charge, and solubility of the molecules that can pass through.

What is a concentration gradient?

• The difference in concentration of a substance between two areas.

• The speed at which particles move in a solution

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NGSS.HS-PS1-5

How does a concentration gradient affect the process of diffusion?

• It creates a difference in concentration between two areas, causing molecules to move from an area of higher concentration to an area of lower concentration.

• It causes molecules to move from an area of lower concentration to an area of higher concentration

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NGSS.HS-PS1-5

Explain the concept of diffusion in relation to a concentration gradient.

• Diffusion is the movement of particles from an area of low concentration to an area of high concentration.

• Diffusion is the movement of particles from an area of high concentration to an area of low concentration.

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NGSS.HS-PS1-5

What factors can affect the rate of diffusion through a membrane?

• Color of the membrane

• Concentration gradient, temperature, surface area, thickness of the membrane, and the size and nature of the molecules involved

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NGSS.HS-PS1-5

Describe the movement of molecules in relation to a concentration gradient.

• Down the concentration gradient

• Up the concentration gradient

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NGSS.HS-PS1-5

How does the size of molecules affect their ability to diffuse through a membrane?

• Larger molecules diffuse faster through the membrane

• Larger molecules have more difficulty passing through the membrane compared to smaller molecules.