Ch. 18 Lehninger biochem test bank Questions with Answers
1. Under which circumstances are amino acids not metabolized via oxidative degradation?
A) Starvation
B) Plants growing in nutrient-rich soils
C) Normal protein turnover
D) A diet rich in proteins
E) Uncontrolled diabetes - correct answers B
2. Which of these is not a protease that acts in the small intestine?
A) Chymotrypsin
B) Elastase
C) Entero peptidase
D) Secretin
E) Trypsin - correct answers D
3. In the digestion of protein that occurs in the small intestine, which enzyme is critical in the activation
of zymogens?
A) Ente opeptidase
B) Hexokinase
C) Papain
D) Pepsin
E) Secretin - correct answers A
, 4. 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 - correct answersE
5. 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 O2.
C) oxidative deamination requiring NAD+.
D) reduction requiring pyridoxal phosphate (PLP).
E) transamination requiring pyridoxal phosphate (PLP). - correct answersE
6. The coenzyme required for all transaminations is derived from:
A) niacin.
B) pyridoxine (vitamin B6).
C) riboflavin.
D) thiamin.
E) vitamin B12. - correct answersB
7. The coenzyme involved in a transaminase reaction is:
A) biotin phosphate.
B) lipoic acid.
1. Under which circumstances are amino acids not metabolized via oxidative degradation?
A) Starvation
B) Plants growing in nutrient-rich soils
C) Normal protein turnover
D) A diet rich in proteins
E) Uncontrolled diabetes - correct answers B
2. Which of these is not a protease that acts in the small intestine?
A) Chymotrypsin
B) Elastase
C) Entero peptidase
D) Secretin
E) Trypsin - correct answers D
3. In the digestion of protein that occurs in the small intestine, which enzyme is critical in the activation
of zymogens?
A) Ente opeptidase
B) Hexokinase
C) Papain
D) Pepsin
E) Secretin - correct answers A
, 4. 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 - correct answersE
5. 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 O2.
C) oxidative deamination requiring NAD+.
D) reduction requiring pyridoxal phosphate (PLP).
E) transamination requiring pyridoxal phosphate (PLP). - correct answersE
6. The coenzyme required for all transaminations is derived from:
A) niacin.
B) pyridoxine (vitamin B6).
C) riboflavin.
D) thiamin.
E) vitamin B12. - correct answersB
7. The coenzyme involved in a transaminase reaction is:
A) biotin phosphate.
B) lipoic acid.
