The substrate of protease is a peptide bond.
An enzyme will alter its substrate although the specific substrate depends on the enzyme.
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Lactose (a carbohydrate)
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both substrate and competitive inhibitor
Generally in an enzyme-catalyzed reaction, the reactant is called the substrate, which in association with the enzyme forms the product.
Most enzymes are substrate specific because they have a specific shapes active site in which only a specific substrate can fit.
The molecule upon which an enzyme acts is called the substrate.
Active site
the active point
It is the opposite of narrow substrate specificity. Broad substrate specific reactions are 'less-picky' in their selection of co-chemical-reactants.