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16. Amino acids are transported to the intestinal epithelial cells by: a. symport mechanism with Na' and removal of Na by sodium/potassium pump b. antiport with Nat c. exchange for glucose d. exchange for K c. exchange for H 17. Which among listed amino acids is not an essential amino acid" ? a Phe b. Tyr c. Thrd. Met e. Glu 18. Maple syrup disease is due to: a. deficient pyruvate dehydrogenase complex b. lack of arginase c. deficient alpha keto glutarate dehydrogenase complex d. deficient alanine-oxaloacetate transaminase e. branched-chain alpha keto acid dehydrogenase complex 19. The defect in phenylalanine hydroxylse leads to: a. accumulation of Tyr b. accumulation of homogentisate c. accumulation of fumarate d. accumulation of phenylpyruvate e, accumulation of melanin 20. The branched chain ketonuria is produced by: a. lack of vit B12 b. defect of tyrosine transaminase c. defect of a-keto acid decarboxylase d. defect of L-methionine adenosyltransferase 21. Which of the listed compounds is the common precursor for melanins, DOPA, epinephrione, norepinephrine?: a. Trp b. Cys c. Met d. Phe e. Tyr 22. The first reaction for the formation of creatine takes place in: a. liver b. skeletal muscle c. kidney d. brain e. hear muscle 23. Which of the listed substances is the ultimate product of heme degradation found in the blood? a. porphobilinogen b. protoporphyrin c. urobilinogen d. stercobilin e. bilirubin 24. The first product synthesized in the formation of heme is: a. porphin b. porphobilinogen c. 8-aminolevulinate d. protoporphyrin e. tetrapyrrole 25. Which is the coenzyme of 8-aminolevulinate synthesis? a. Biotin b. Biopterin c. Tetrahydrofolate d. Vitamin B2 e. Pyridoxal phosphate 26. The name of the complex of iron with protein that is carried in the blood stream is called: a. hemosiderin b. apoferritin e. ferritin d. apotransferrin e. transferrin