In order for a reaction to occur,many enzymes require ATP and ADP,which temporarily bind to and then release from the substrate.ATP and ADP are therefore considered to be

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ATP and ADP are considered to be coenzymes because they temporarily bind to and release from the enzyme's substrate. They are not substrates themselves and do not permanently bind to the enzyme like a prosthetic group. They also do not directly participate in the reaction like cocatalysts.

In Order for a Reaction to Occur,many Enzymes Require ATP