Question

question 7
1 pts
what is the difference between simple diffusion and facilitated diffusion through a cell membrane?

facilitated diffusion uses carrier proteins, simple diffusion does not
facilitated diffusion uses energy, simple diffusion does not
simple diffusion uses carrier proteins, facilitated diffusion does not
facilitated diffusion uses vacuoles, simple diffusion does not

question 8
1 pts
what would happen to the cells of a jellyfish (who normally lives in the ocean), if it were placed in a freshwater pond?

the jellyfishs cells would swell because the pond is hypertonic
the jellyfishs cells would shrivel because the pond is hypotonic
the jellyfishs cells would shrivel because the pond is hypertonic
the jellyfishs cells would swell because the pond is hypotonic

Explanation:

Analyze Question 7

Using the Simple Diffusion and Facilitated Diffusion knowledge points

• Both simple and facilitated diffusion are passive transport mechanisms that move substances down their concentration gradient without requiring energy.
• Simple diffusion allows small, nonpolar molecules to pass directly through the lipid bilayer.
• Facilitated diffusion requires specialized membrane proteins, such as channel or carrier proteins, to help polar or charged molecules cross.
• Therefore, facilitated diffusion uses carrier proteins, while simple diffusion does not.

Analyze Question 8

Using the Tonicity knowledge point

• Jellyfish cells are adapted to marine environments, meaning their internal solute concentration is isotonic to saltwater.
• Freshwater has a much lower solute concentration than saltwater, making the pond water hypotonic relative to the jellyfish's cells.
• Water moves via osmosis from areas of lower solute concentration (hypotonic pond) to higher solute concentration (inside the cells).
• Consequently, water enters the cells, causing them to swell.

Answer:

Question 7

• facilitated diffusion uses carrier proteins, simple diffusion does not (Correct answer)
• facilitated diffusion uses energy, simple diffusion does not
• simple diffusion uses carrier proteins, facilitated diffusion does not
• facilitated diffusion uses vacuoles, simple diffusion does not

Question 8

• the jellyfish's cells would swell because the pond is hypertonic
• the jellyfish's cells would shrivel because the pond is hypotonic
• the jellyfish's cells would shrivel because the pond is hypertonic
• the jellyfish's cells would swell because the pond is hypotonic (Correct answer)