Wich pair of molecules both contain carbon atoms ?

Fats and Proteins

Explanation:

Fats and Proteins are the kind of the primary molecules that contain carbon atoms. Of course other molecules such as water, and carbohydrates both contain carbon atoms.

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enzyme active site and substrate specificity

enzymes bind with chemical reactants called substrates. there may be one or more substrates for each type of enzyme, depending on the particular chemical reaction. in some reactions, a single-reactant substrate is broken down into multiple products