Enzymes speed up chemical reactions by acting as a biological catalyst. The reaction can be both intra & extra cellular.
- Enzymes are globular proteins that have an active site that has a specific shape that is determined by its tertiary structure. Because of this complimentary shape enzymes can only normally catalyse one reaction.
- Enzymes reduce the activation energy (the energy required to start the reaction). When the enzyme-substrate complex forms it is this which lowers the activation energy because:
If two substrates need to be joined together by attaching to the enzyme they would come close together reducing the repulsion meaning that they can come together easily.