It might seem odd that we have an enzyme in our bodies that catalyzes a "reversible reaction"; one that goes either forward or backward, depending on the relative concentrations of reactants. What's the point of that? How is it that the enzyme is helpful to an organism in that case?
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hmm.. i Recall the relationship between the forward and reverse reaction rates when a reaction is at equilibrium A catalyst speeds up the rate of a chemical reaction, but has no effect upon the equilibrium position for that reaction.
In theory, all chemical reactions are in fact double reactions: for every forward reaction, there is a subsequent reverse reaction. The idea can be illustrated as follows:
For plenty of reactions, however, the forward reaction is so favored, and the reverse reaction is so negligible, that reactions are written simply in terms of the solid forward arrow, A→B. However, we will now consider forward/reverse reaction pairs that exist in chemical equilibrium with one another.
And so will be the case of Enzyme, i guess. ref: http://www.chem1.com/acad/webtext/chemeq/Eq-01.html
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Actually, all enzymatic reactions are reversible....but it's just that some are more so than others.
Most people say that, but in fact its really not true that the product doesn't fit into the active site. It did up until the bonds holding it there broke, right!? So, it's best to think of the active site as something that isn't so rigid only *one* type of molecule can fit into it.
Note: Do not confuse chemical reactions with enzymatic reactions. Enzymes are not chemicals, and do not always catabolize or anabolize chemicals. They can also turn on/off proteins, cleave proteins, ligate proteins or nucleotides, etc. Some enzymes can perform a reversible reaction but some CANNOT. Just remember that.
For some Kinetics refer this