Which of the Following is a Form of Active Transport

Question

Which of the following is a form of active transport?  
A) Osmosis
B) Facilitated diffusion
C) Simple diffusion
D) Sodium-potassium pump
E) Glucose transporter

Accepted Answer

The sodium-potassium pump is a form of active transport, as it utilizes energy in the form of ATP to move sodium and potassium ions against their concentration gradients. Osmosis, facilitated diffusion, and simple diffusion are all forms of passive transport, which do not require energy input. The glucose transporter can be either a form of facilitated diffusion or active transport, depending on the concentration gradient and energy requirements.