| A | B |
|---|
| catalysts | speed up the rate of chemical reactions |
| enzymes | special group of proteins that act as catalysts |
| active site | area of an enzyme onto which the substrate must fit |
| amino acids | subunits of proteins |
| peptide bonds | join amino acids together to form long chains |
| substrate | molecule on which an enzyme acts |
| lock-and-key | model of enzyme activity |
| lock | represents the SUBSTRATE because it is changed by the reaction |
| key | represents the ENZYME because it is specific due to its active site |
| open lock | represents the PRODUCTS because it is the result of the enzyme's activity in the reaction |
