Question

question 20
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in this type of passive transport process, a solute (such as glucose) binds to a
specific transmembrane protein to enter the cell by moving down its
concentration gradient (from high to low concentration).
which of the following best describes this process?
simple diffusion
facilitated diffusion
osmosis
active membrane transport

Explanation:

• Simple diffusion: Solutes move directly through the membrane without a protein carrier.
• Facilitated diffusion: Solutes (like glucose) bind to a transmembrane protein and move down their concentration gradient (passive).
• Osmosis: Movement of water, not solutes like glucose.
• Active membrane transport: Requires energy (ATP) and moves against the concentration gradient.

Answer:

Facilitated diffusion