Question

carrier-mediated facilitated diffusion and active transport have in common that both
◯ are processes involving transport of a solute up its concentration gradient
◯ are processes involving transport of a solute down its concentration gradient
◯ are processes that require an integral protein to help transport molecules
◯ are processes involving the use of energy provided by atp
◯ are processes independent of atp
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Explanation:

To solve this, we analyze each option:

• Option 1: Active transport moves solute against (up) its concentration gradient, while facilitated diffusion moves solute down its gradient. So this is incorrect.
• Option 2: Facilitated diffusion moves solute down its concentration gradient (passive, no ATP), and active transport moves solute up its gradient (requires ATP). So this is incorrect.
• Option 3: Both carrier - mediated facilitated diffusion and active transport require integral membrane proteins (carrier proteins) to help transport molecules across the membrane. This is a common feature.
• Option 4: Facilitated diffusion does not use ATP, only active transport does. So this is incorrect.
• Option 5: Active transport requires ATP, facilitated diffusion does not. So this is incorrect.

Answer:

C. are processes that require an integral protein to help transport molecules