Active transport differs from facilitated diffusion in that active transport
Correct answer: B. requires ATP and can move a substance against its concentration gradient
- A. does not require a carrier protein
- B. requires ATP and can move a substance against its concentration gradient
- C. occurs only in plant cells
- D. moves only water molecules
Explanation
Both use carrier proteins, but facilitated diffusion is passive and can only run down a gradient, whereas active transport spends ATP and can therefore concentrate a substance on one side of the membrane. This is how glucose is fully reabsorbed in the kidney tubule and how root hair cells take in mineral ions from very dilute soil water. Cells performing much active transport are rich in mitochondria.
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About Animal and Plant Cell
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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