Question

1. protein channels are used in which type of passive transport?

osmosis
diffusion
facilitated diffusion

Explanation:

Osmosis is the diffusion of water across a semi - permeable membrane without the use of protein channels. Diffusion is the movement of substances from high to low concentration without the help of protein channels for most small, non - polar molecules. Facilitated diffusion is a type of passive transport that uses protein channels (or carrier proteins) to move substances (such as ions and polar molecules) across the cell membrane down their concentration gradient.

Answer:

facilitated diffusion