I have a question about coupled ractions..I was given a question asking: Do the

Question

I have a question about coupled ractions..I was given a question asking:

Do the equations below represent coupled reactions? If so, why? If not, why?

A + B <------> C + D - - delta G

E + H <------> F + G + delta G

___________

- delta G

1)The only thing about these equations that would lead me to think they don't represent coupled reactions is the fact that the +deltaG reaction is coming after the --deltaG(I'm assuming there are 2 - because it's more negative than the other is positive) and I read somewhere that when it happens the negative reaction comes directly after the positive... would this have to be shown in that order when writing the equations like this or am I over thinking it... and this is actually representing a coupled reaction?

2) I don't get why the second reaction uses the letters like that... is there any significance to it?

Explanation / Answer

If they were coupled reactions written intelligently they would have to be:
(1) the way you say, with the positive G reaction first, and the negative G reaction following right away.

(2) some reagent participates in both, directly or indirectly, by providing energy through some dephosphorylation of ATP or redox by NAD+/NADH, or by immediately acting to eliminate one product of the first one or acting on it to move the precarious equilibrium to the right.

In this case none of the letters from the first repeat on the 2nd. one.

They do not represent a coupled reaction in any of the ways they are commonly notated as such. My answer is "NO".

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