Question

multiple choice question the movement of molecules down their concentration gradient, with the assistance of an integral membrane protein, is known as: osmosis facilitated diffusion active transport endocytosis

Explanation:

• Osmosis is the movement of water across a semipermeable membrane, not general molecules with a protein helper.
• Facilitated diffusion is the process where molecules move down their concentration gradient (from high to low concentration) with the help of integral membrane proteins (like channels or carriers).
• Active transport requires energy and moves molecules against the concentration gradient.
• Endocytosis is the process of a cell taking in large particles or substances by engulfing them, not related to moving down a concentration gradient with a membrane protein for small molecules.

Answer:

B. facilitated diffusion