Question

multiple choice question the movement of molecules across a membrane with the aid of a transporting protein that does not require cellular energy is called ______. facilitated diffusion passive diffusion group translocation active transport

Explanation:

To solve this, we analyze each option:

• Facilitated diffusion: Involves transport proteins (like channels or carriers) to move molecules across a membrane down their concentration gradient, no energy required. This matches the description.
• Passive diffusion: Molecules move directly through the membrane (no transport protein) down the gradient, so this is incorrect as the question mentions a transporting protein.
• Group translocation: A type of active transport where the molecule is chemically modified during transport, requiring energy, so incorrect.
• Active transport: Requires cellular energy (ATP) to move molecules against the gradient, so incorrect.

Answer:

A. facilitated diffusion