Facilitated diffusion differs from simple diffusion in that it
Correct answer: B. uses specific carrier or channel proteins in the membrane
- A. requires energy from ATP
- B. uses specific carrier or channel proteins in the membrane
- C. moves substances against their concentration gradient
- D. occurs only through the lipid portion of the membrane
Explanation
Facilitated diffusion still follows the concentration gradient and costs no energy, but polar molecules and ions pass through specific protein channels or carriers. Needing ATP or moving against the gradient would make it active transport, a common trap in the comparison.
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Animal and plant cells share a plasma membrane, cytoplasm, nucleus, ribosomes, mitochondria and endoplasmic reticulum, but plant cells also have a cellulose cell wall, chloroplasts and a large permanent vacuole. Questions cover organelle structure and function, differences between the two cell types, and how membranes control movement of substances.
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