Chapter 18 Testbank - Chapter 18 Amino Acid Oxidation and...

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Chapter 18 Amino Acid Oxidation and the Production of Urea Multiple Choice Questions 1. Metabolic fates of amino groups Pages: 675-676 Difficulty: 2 Ans: D Which of these is not a protease that acts in the small intestine? A) Chymotrypsin B) Elastase C) Enteropeptidase D) Secretin E) Trypsin 2. Metabolic fates of amino groups Page: 676 Difficulty: 2 Ans: A In the digestion of protein that occurs in the small intestine, which enzyme is critical in the activation of zymogens? A) Enteropeptidase B) Hexokinase C) Papain D) Pepsin E) Secretin 3. Metabolic fates of amino groups Page: 676 Difficulty: 2 Ans: E Which of the following is a zymogen that can be converted to an endopeptidase that hydrolyzes peptide bonds adjacent to Lys and Arg residues? A) Chymotrypsinogen B) Pepsin C) Pepsinogen D) Trypsin E) Trypsinogen 4. Metabolic fates of amino groups Page: 677 Difficulty: 2 Ans: E In amino acid catabolism, the first reaction for many amino acids is a(n): A) decarboxylation requiring thiamine pyrophosphate (TPP). B) hydroxylation requiring NADPH and O 2 . C) oxidative deamination requiring NAD + . D) reduction requiring pyridoxal phosphate (PLP). E) transamination requiring pyridoxal phosphate (PLP).
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Amino Acid Oxidation and the Production of Urea 5. Metabolic fates of amino groups Page: 677 Difficulty: 2 Ans: B The coenzyme required for all transaminations is derived from: A) niacin. B) pyridoxine (vitamin B 6 ). C) riboflavin. D) thiamine. E) vitamin B 12 . 6. Metabolic fates of amino groups Page: 677 Difficulty: 1 Ans: D The coenzyme involved in a transaminase reaction is: A) biotin phosphate. B) lipoic acid. C) nicotinamide adenine dinucleotide phosphate (NADP + ). D) pyridoxal phosphate (PLP). E) thiamine pyrophosphate (TPP). 7. Metabolic fates of amino groups Page: 677 Difficulty: 1 Ans: D Transamination from alanine to α -ketoglutarate requires the coenzyme: A) biotin. B) NADH. C) No coenzyme is involved. D) pyridoxal phosphate (PLP). E) thiamine pyrophosphate (TPP). 8. Metabolic fates of amino groups Page: 677 Difficulty: 1 Ans: E Pyridoxal phosphate is a cofactor in this class of reactions: A) acetylation. B) desulfuration. C) methylation. D) reduction. E) transamination. 9. Metabolic fates of amino groups Pages: 677-678, 680 Difficulty: 2 Ans: A Which of the following is not true of the reaction catalyzed by glutamate dehydrogenase? A) It is similar to transamination in that it involves the coenzyme pyridoxal phosphate (PLP). B) NH 4 + is produced. C) The enzyme can use either NAD + or NADP + as a cofactor. D) The enzyme is glutamate-specific, but the reaction is involved in oxidizing other amino acids. E) α -Ketoglutarate is produced from an amino acid. 226
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Chapter 18 Testbank - Chapter 18 Amino Acid Oxidation and...

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