<prompt> Which of the following are metalloporphyrins?HemoglobinCatalaseBilirubinCytochrome  <response>: Hemoglobin consists of heme and globin.in which heme pa consists of porphyrin ring and metallic iron.Ref: DM Vasudevan - Textbook of Biochemistry for Medical Students, 7th edition, page no: 271 