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161. Which of the following is a precursor of protoporphyrin_______________?
A. Alanine
B. Leucine
C. Histidine
D. Glycine

162. Cytochromes are_____________?
A. Pyridine nucleotides
B. Riboflavin containing nucleotides
C. Metal containing flavoproteins
D. Iron-porphyrin proteins

163. Heme in haemoglobin is____________?
A. Between Helix C and D
B. Surrounded by non polar environment
C. Bonded to E7 histidine
D. Protoporophyrin IX

164. Which of the following is correct about breakdown of hemoglobin (Hb)_____________?
A. Hb→Heme→bilirubin→Urobilinogen
B. Heme→Hb→Biliverdin→Urobilinogen
C. Hb→Heme→Bilverdin→Uro bilinogen
D. Hb→Heme→bilirubin→Urobilinogen→Biliverdin

165. Creatine is formed metabolically from______________?
A. Tryptophan
B. Arginine
C. Phenylalanine
D. Histidine

166. Major source of ammonia in the kidney is___________?
A. Urea Aspartate
B. Aspartate
C. Glutamine
D. Glutamate


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