Question

question 42 of 50
which of the following uses a protein to move a molecule across a cell membrane without energy?
a. osmotic pressure
b. facilitated diffusion
c. simple diffusion
d. active transport

Explanation:

Facilitated diffusion is a passive transport process (no energy input like ATP) that uses transport proteins (channel or carrier proteins) to move molecules (such as polar or large molecules) across the cell membrane. Osmotic pressure is a measure related to the movement of water in osmosis (a type of simple diffusion for water). Simple diffusion does not use proteins. Active transport uses energy (usually ATP) and proteins.

Answer:

B. Facilitated diffusion