Enzymes involved in biochemical reactions are best described as

• A. Catalysts
• B. Colloids
• C. Cathodes
• D. Constants

Answer: (A)

Enzymes act as catalysts in biochemical reactions, speeding up the process by lowering the activation energy needed to reach the transition state. They achieve this with a specific active site that binds substrates precisely, aligns them for the reaction, and stabilizes the transitioning molecules, allowing more collisions to lead to product formation. Importantly, enzymes are not consumed in the reaction and can be reused many times. They’re not colloids, which are mixtures of particles; not cathodes, which are electrodes in electrochemical cells; and not constants, which are fixed values.