<P> Enzymes / ˈɛnzaɪmz / are macromolecular biological catalysts . Enzymes accelerate chemical reactions . The molecules upon which enzymes may act are called substrates and the enzyme converts the substrates into different molecules known as products . Almost all metabolic processes in the cell need enzyme catalysis in order to occur at rates fast enough to sustain life . Metabolic pathways depend upon enzymes to catalyze individual steps . The study of enzymes is called enzymology and a new field of pseudoenzyme analysis has recently grown up , recognising that during evolution , some enzymes have lost the ability to carry out biological catalysis , which is often reflected in their amino acid sequences and unusual ' pseudocatalytic ' properties . </P>
<P> Enzymes / ˈɛnzaɪmz / are macromolecular biological catalysts . Enzymes accelerate chemical reactions . The molecules upon which enzymes may act are called substrates and the enzyme converts the substrates into different molecules known as products . Almost all metabolic processes in the cell need enzyme catalysis in order to occur at rates fast enough to sustain life . Metabolic pathways depend upon enzymes to catalyze individual steps . The study of enzymes is called enzymology and a new field of pseudoenzyme analysis has recently grown up , recognising that during evolution , some enzymes have lost the ability to carry out biological catalysis , which is often reflected in their amino acid sequences and unusual ' pseudocatalytic ' properties . </P>
what are molecules known as before an enzyme converts them
what are molecules known as before an enzyme converts them
substrates
substrates