Summary: Transport reactions are reactions in which at least one species is transported across a membrane. The species may or may not be chemically modified in the course of the reaction. Typically, transport reactions are catalysed by membrane proteins known as transporters (with the exception of simple diffusion reactions). Transporters can function without an input of energy (faciltated diffusion), or they can be driven by electrochemical potential gradients (secondary transport) or by other energy sources such as light or ATP hydrolysis (primary transport).
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