Which of the following are metalloporphyrins?: (A) Hemoglobin, (B) Catalase, (C) Bilirubin, (D) Cytochrome
Answer is A. 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