Facilitated diffusion through a carrier protein involves transport by

Question

BlackTom AI · Accepted Answer

Question restatement: Facilitated diffusion through a carrier protein involves transport by

Option 1: 'Creating an opening which molecules can diffuse through along its concentration gradient' — This describes simple diffusion through a pore or channel, not facilitated diffusion where a carrier undergoes conformational change. It implies a static opening rather than a carrier-mediated process, so this is incorrect.

Option 2: 'Using energy to pump molecules against its concentration gradient' — This characterizes active transport, which uses energy (often ATP or a proton motive force) to move substances uphill. Facilitated diffusion does not require energy input and moves substances down their gradient, so this is incorrect.

Option 3: 'Using changes to protein shape to bring molecules across the membrane down its concentration gradient' — This accurately captures the mechanism of facilitated diffusion via a carrier protein: substrate binds, the protein changes shape, and the molecule moves down its gradient without energy expenditure. This aligns with the core concept of carrier-mediated facilitated diffusion.

Option 4: 'Creating a vesicle to carry large amounts of molecules across the membrane' — This describes vesicular transport (such as endocytosis or exocytosis), which is a bulk transport mechanism and not carrier-facilitated diffusion. Therefore, this is incorrect.

In summary, the incorrect statements either describe passive diffusion without carrier involvement, active transport requiring energy, or vesicle-based bulk transport, while the correct mechanism involves carrier proteins changing shape to move molecules down their concentration gradient without direct energy use.

Facilitated diffusion through a carrier protein involves transport bySingle choice

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