Question

unit 1.4 cell transport, homeostasis, feedback quiz 2025
which of these statements describes some aspect of facilitated diffusion?
∘ facilitated diffusion requires energy
∘ facilitated diffusion is another name for osmosis.
∘ facilitated diffusion of solutes may occur through channel or transport proteins in the membrane.
∘ facilitated diffusion of solutes occurs through phospholipid pores in the membrane.

Explanation:

1. Analyze the first option: Facilitated diffusion is a passive transport process, which means it does not require energy (energy - requiring transport is active transport). So this option is incorrect.
2. Analyze the second option: Osmosis is the diffusion of water across a selectively permeable membrane, while facilitated diffusion is the transport of solutes (like ions or large molecules) with the help of transport proteins. They are not the same, so this option is incorrect.
3. Analyze the third option: Facilitated diffusion involves the movement of solutes (molecules that cannot pass through the lipid bilayer easily) through channel proteins or carrier (transport) proteins embedded in the cell membrane. This is a correct description of facilitated diffusion.
4. Analyze the fourth option: The cell membrane's phospholipid bilayer does not have pores for solute transport in facilitated diffusion. Solutes use transport proteins, not phospholipid pores. So this option is incorrect.

Answer:

C. Facilitated diffusion of solutes may occur through channel or transport proteins in the membrane. (Here we assume the options are labeled A, B, C, D in order. If the original labeling is different, adjust accordingly. But based on the given options, the correct one is "Facilitated diffusion of solutes may occur through channel or transport proteins in the membrane".)