In which of the following processes, active transport is NOT used?
- A.Reabsorption of amino acids and glucose from kidney into blood
- B.Loading sugar from photosynthesizing leaf cells into phloem tissue for transportation
- C.Passage of Na+ and Cl- through hydrophilic channel created by protein molecules
- D.Absorption of glucose and electrolytes into the bloodstream
Show answer
Movement of ions through protein channels is facilitated diffusion, a passive process that needs no energy from ATP. Active transport moves substances against their concentration gradient, from low to high concentration, using carrier proteins and energy, usually from ATP.
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