Membrane Transport
Facilitated diffusion differs from active transport because it:
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About This Question
- Subject
- biology
- Chapter
- cell structure and function
- Topic
- membrane transport
- Difficulty
- Medium
- Year
- 2025
Solution
Correct Answer:
Requires carrier proteins but no energy
- Passive Transport: Includes simple diffusion and facilitated diffusion. Molecules move down their concentration gradient (from high to low concentration).
- Facilitated vs Simple: Simple diffusion happens through the bilayer; facilitated diffusion uses specific carrier proteins or channels because the molecule is polar/large.
- Active Transport: Moves molecules against the gradient (from low to high concentration), which requires energy (ATP).
- Key Difference: While both use protein carriers, facilitated diffusion does not require energy input and cannot move substances against a gradient.
This medium difficulty biology question is from the chapter cell structure and function, covering the topic of membrane transport. It appeared in the 2025 exam.
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