Enzymes are biological molecules (proteins) that act as
catalysts and to help complex reactions to occur everywhere in life. Proteases
would go to work and help break down the peptide bonds between the amino acids. Enzymes take part in the reaction - that is how they provide
an alternative reaction pathway. But they do not undergo permanent changes and
so remain unchanged at the end of the reaction. They can only alter the rate of
reaction, not the position of the equilibrium.
Lock and key hypothesis
This is the simplest model to represent how an enzyme works.
The substrate simply fits into the active site to form a reaction intermediate.
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