Question

question 9 of 32
if a solute is moving through a phospholipid bilayer from an area of higher concentration to an area of lower concentration without the assistance of a protein, the manner of transport must be ______ .
○ simple diffusion
○ solutes cannot cross phospholipid bilayers.
○ facilitated diffusion
○ solutes may use active transport, facilitated diffusion, or simple diffusion, depending on the solute.
○ active transport

Explanation:

Simple diffusion is the passive movement of solutes across a phospholipid bilayer from high to low concentration without protein assistance. Facilitated diffusion requires proteins, active transport uses energy against the gradient, and solutes can cross bilayers (e.g., small nonpolar molecules). Thus, the described transport matches simple diffusion.

Answer:

simple diffusion