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The enzyme catalase protects a cell by breaking down ________.

  • A.superoxide radicals
  • B.hydrogen peroxide
  • C.hydroxyl radicals
  • D.singlet oxygen

Answer: C

Correct answer: hydrogen peroxide

Catalase converts hydrogen peroxide into water and oxygen, which is why a drop of peroxide bubbles on a catalase-positive colony. Superoxide dismutase handles the separate task of converting superoxide radicals into peroxide and oxygen.

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