Enzymes as Catalysts


In this section we look at what enzymes are and at some examples of enzyme catalysed reactions.

Contents of this unit

What are enzymes?

Enzymes are a particular kind of protein that have the ability to catalyse reactions in living organisms. Proteins are very long chain molecules made up of amino acid building blocks. The protein chain is folded in a complex three dimensional shape known as its tertiary structure. The chain is held in this shape by interactions between different parts of the chain.

The structure of the enzyme catalase, which catlyses the breakdown of hydrogen peroxide.