How does a molecular compound compare to the elements that make up the compound?

The only difference between a molecular compound and an element is that in an element all the molecules are the same, but in a molecular compound there are different types of elements that make up the compound.

So an element is something you find on the periodic table, a molecular compound is created using different types of elements.

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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