Final answer:
Option (E) Oxygen transport is not an example of facilitated diffusion, as oxygen usually diffuses directly through the cell membrane without the need for a transport protein.
Step-by-step explanation:
The question focuses on identifying which option is not an example of facilitated diffusion. Facilitated diffusion is a passive transport mechanism where substances move down their concentration gradient through specific membrane receptors or channel proteins, without the use of energy. Options (A), (B), (C), and (D) are all examples of facilitated diffusion:
- (A) Glucose transport by GLUT1
- (B) Chloride-bicarbonate exchange
- (C) Aquaporin transport
- (D) Ion channel transport
However, option (E) Oxygen transport, typically occurs via simple diffusion, not facilitated diffusion, as oxygen is a small, nonpolar molecule that can easily diffuse across the cell membrane without the aid of a transport protein.