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      Question

      Which enzyme is primarily responsible for the enzymatic

      browning of fruits and vegetables?
      A Lipo-oxidase Correct Answer Incorrect Answer
      B Polyphenol-oxidase (PPO) Correct Answer Incorrect Answer
      C Amylase Correct Answer Incorrect Answer
      D Protease Correct Answer Incorrect Answer

      Solution

      PPO catalyzes the oxidation of phenolic compounds into quinones when tissues are cut or bruised. These quinones then polymerize to form the dark brown pigments seen on the surface.

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