What are Enzyme Substrates?
A substrate is something acted upon in biochemical reaction. The enzyme binds its substrate by forming weak chemical bonds with it. Since these bonds break rapidly it is a readily reversible reaction and so the enzyme, substrate and enzyme-substrate complex will exist in a state of equilibrium. If you could examine all of the enzyme molecules individually at one time, you would find that a proportion of them existed as free enzyme molecules, while the remainder exist, bound to substrate molecules, in the form of an enzyme-substrate complex.
