The question is incomplete but I attached the diagram here and it is likely that the enzyme affects reactions involving molecule C.
A chemical reaction is a process where molecules called reactants are converted into products.
An enzyme is a biological catalyst that shows specificity on one reactant, whereas molecules can be either reactants or products.
Enzymes are proteins that act as biological catalysts by speeding up the velocity of a chemical reaction.
In conclusion, the question is incomplete, but I attached the diagram and it is likely that the enzyme affects reactions involving molecule C..
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