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Points to bear in mind That the biological coupling of an energetically favourable and unfavourable reaction (I would avoid using the term spontaneous†) is done through a composite reaction involving all the components of the two separate reactions. The reactants and products are the same as in the sum of the separate reactions — so it is valid to ...


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Keep in mind that there needs to be an enzyme present to "couple" two reactions. You can imagine it like the energy from the ATP hydrolysis pushing the enzyme to a high energy state, and from that high energy state the enzyme can push the secondary reaction against the equilibrium. You could do this, and there might even be examples (maybe for some ...



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