Question

Which one of the following enzymes contains ‘Haem’ as the prosthetic group?

Options

• RuBisCo

• Carbonic anhydrase

• Succinate dehydrogenase

• Catalase

Answer 1

Catalase

Explanation:

The enzyme catalase is essential for preventing oxidative damage to cells because it converts hydrogen peroxide into oxygen and water. Its action depends on the prosthetic group “Haem,” which is an iron-porphyrin complex.

Other enzymes:

• RuBisCO: No haem, it binds CO₂ in the Calvin cycle.
• Carbonic anhydrase: Contains zinc, not haem.
• Succinate dehydrogenase: Uses FAD and ironsulfur clusters, not haem.