Definition for Substrate
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Substrates are chemicals that bind to the enzyme and become altered (bonds formed and/or broken), producing a product. A product is the result of enzyme action on substrates. These terms are relative because chemical reactions are reversible. Example: if two monomers bind to the enzyme and form a dimer, the monomers are the substrates and the dimer is the product. If instead the dimer binds to the enzyme and splits to form two monomers, the monomers are the products and the dimer is the substrate.
