Catechol is a chemical present in several fruits. The enzyme catechol oxidase can oxidise catechol into a quinone. Parahydroxybenzoic acid (PHBA), which has a structure similar to catechol, inhibits catechol oxidase. Phenylthiourea (PTU) also inhibits catechol oxidase by binding to a copper atom in the enzyme. In what way do both of these inhibitors lower enzyme activity?
- A1, 2 and 3
- B1 only
- C2 only
- D3 only