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Both processes move molecules against their concentration gradient (from low to high concentration). Because they move against the gradient, they require energy. The key difference lies in where that energy comes from . 1. Primary Active Transport The Energy Source: Uses energy directly from the hydrolysis of ATP (adenosine triphosphate).
Add: 3rd Floor, B21 Area,3rd Software Park, Jimei District, Xiamen,Fujian, China
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