Moderate

Iron is present in all of the following except_______________?

Correct answer: D. Pyruvate kinase

  • A. Myoglobin
  • B. Cytochrome
  • C. Catalase
  • D. Pyruvate kinase

Explanation

Myoglobin, cytochromes and catalase contain heme iron for oxygen binding or electron and peroxide reactions. Pyruvate kinase is a glycolytic enzyme that does not contain iron as a prosthetic group.

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