Is it possible that some enzymes might fall under more than one classification? Why or why not?
The answer is: IT DEPENDS.
It depends on the criteria of classifying the enzymes. Most enzyme classifications are based on the enzyme function.
Other classifications are made using the structural similarity as the defining criteria.
Still more advanced level classifications use the metal requirement of the enzyme as a criteria of classification.
Basically there is no robust way of classifying enzyme, it's just our attempt to create a data research tool to help us in research queries.
So it's defnintely possible that a single enzyme can fall in more than one categories. 'Multi-functional' enzymes are those which have multiple active sites and can catalyze many reaction types.
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