Question

carrier proteins a type of facilitated diffusion uses _______________ to move particles across/through the cell membrane.
membrane proteins
nothing (no help)
vesicles
none of the above

Explanation:

Facilitated diffusion is a passive - transport process. Carrier proteins are a type of membrane proteins that help move particles across the cell membrane down their concentration gradient. Vesicles are used in processes like endocytosis and exocytosis, not in facilitated diffusion. And facilitated diffusion requires help from proteins.

Answer:

Membrane Proteins