Coupled transport differs from primary active transport due to the fact that it uses as a direct source of energy. coupled transport differs from primary active transport due to the fact that it uses as a direct source of energy.

Answer is: coupled transport differs from primary active transport due to the fact that it uses electrochemical potential difference as a direct source of energy.
Primary active transport directly uses metabolic energy (adenosine triphosphate- ATP) to transport molecules across a membrane.
In secondary active transport (coupled transport) there is no direct coupling of ATP, energy derived from the pumping of protons across a cell membrane.

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