Question

multiple choice question
which of the transport mechanisms relies only on concentration gradients to provide the \force\ to move materials across the plasma membrane?

• passive diffusion
• secondary active transport
• primary active transport
• group translocation transport

Explanation:

Passive diffusion is a type of passive transport that solely uses the natural concentration gradient (movement from an area of higher solute concentration to lower concentration) as the driving force for moving substances across the plasma membrane, requiring no energy input. Secondary active transport uses the gradient from primary active transport, primary active transport uses ATP energy, and group translocation modifies the substance while using energy, so they do not rely only on concentration gradients.

Answer:

A. Passive diffusion