High proton concerntration Low sucrose concentration H* Sucrose Proton pump 4-ATPase) Sucrose proton cotransporter ATP Sucrose Low proton concentration High sucrose concentration In protein above, the energy for the transport of sucrose against its concentration gradient comes directly from O hydrolysis of GTP movement of another solute along its concentration gradient. O hydrolysis of ATP. Proton gradient Sucrose gradient

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