Question

The movement of small, uncharged particles across lipid bilayers is

A) Facilitated Diffusion
B) Active Transport
C) Simple Diffusion
D) Endocytosis

Answer 1

The movement of small, uncharged particles across the lipid bilayer is achieved through Simple Diffusion. This passive transport method allows molecules to move along their concentration gradient without the need for energy or transport proteins.

Step-by-step explanation:

The movement of small, uncharged particles across lipid bilayers best corresponds to C) Simple Diffusion. In simple diffusion, such particles move from an area of higher concentration to an area of lower concentration directly through the membrane without the assistance of transport proteins and without expending energy. This process is how very small, hydrophobic molecules, such as oxygen and carbon dioxide, typically enter and leave cells. Larger or charged particles would require facilitated diffusion or other transport mechanisms to cross the lipid bilayer.