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ENZYMES- Part 11
See all quizzes of ENZYMES- Part 11 here:
1 Enzymes requiring NAD as co-substrate
can be assayed by measuring change in
absorbance at
(A) 210 nm (B) 290 nm
(C) 340 nm (D) 365 nm
2. Different isoenzymes of an enzyme have
the same
(A) Amino acid sequence
(B) Michaelis constant
(C) Catalytic activity
(D) All of these
3. From the pentapeptide, phe-ala-leu-lysarg,
phenylalanine residue is split off by
(A) Trypsin (B) Chymotrypsin
(C) Aminopeptidase (D) Carboxypeptidase
4. A high-energy phosphate among the
following is
(A) Glucose-6-phosphate
(B) Glucose-1-phosphate
(C) 1, 3-Biphoglycerate
(D) All of these
5. The highest energy level is present
amongst the following in
(A) 1, 3-Biphosphoglycerate
(B) Creatine phosphate
(C) Carbamoyl phosphate
(D) Phosphoenol pyruvate
6. Daily urinary urobilinogen excretion in
adult men is
(A) 0–4 mg (B) 5–8 mg
(C) 9–12 mg (D) 13–20 mg
7. In obstructive jaundice, faecal urobilinogen
is
(A) Absent (B) Decreased
(C) Increased (D) Normal
8. Acetyl-CoA can be formed from
(A) Pyruvate (B) Fatty acids
(C) ketone bodies (D) All of these
9. Pyruvate is converted into acetyl-CoA by
(A) Decarboxylation
(B) Dehydrogenation
(C) Oxidative decarboxylation
(D) Oxidative deamination
10. Conversion of pyruvate into acetyl CoA
is catalysed by
(A) Pyruvate dehydrogenase
(B) Didrolipoyl acetyl transferase
(C) Dihydrolipoyl dehydrogenase
(D) All the 3 acting in concert
11. Pyruvate dehydrogenase complex is
located in
(A) Cytosol
(B) Lysosomes
(C) Mitochondria
(D) Endoplasmic reticulum
12. A flavoprotein in pyruvate dehydrogenase
complex is
(A) Pyruvate dehydrogenase
(B) Didrolipoyl acetyl transferase
(C) Dihydrolipoyl dehydrogenase
(D) None of these
13. Pyruvate dehydrogenase complex is
regulated by
(A) Covalent modification
(B) Allosteric regulation
(C) Both (A) and (B)
(D) None of these
14. An allosteric inhibitor of pyruvate dehydrogenase
is
(A) Acetyl CoA (B) ATP
(C) NADH (D) Pyruvate
15. Ribozymes:
(A) RNA enzyme (B) Non-protein enzymes
(C) Catalyst function (D) All of these
16. In citric acid cycle, NAD is reduced in
(A) One reactions (B) Two reactions
(C) Three reactions (D) Four reactions
17. Among citric acid cycle enzymes, a flavoprotein
is
(A) Malate
(B) Fumarase
(C) Succinate dehrogenase
(D) Isocitrate dehrogenase
18. In citric acid cycle, GDP is phosphorylated
by
(A) Succinate dehydrogenase
(B) Aconitase
(C) Succinate thiokinase
(D) Fumarse
19. Malonate is an inhibitor of
(A) Malate dehydrogenase
(B) α-Ketoglutarate dehydrogenase
(C) Succinate dehydrogenase
(D) Isocitrate dehydrogenase
20. Isocitrate dehydrogenase is allosterically
inhibited by
(A) Oxalosuccinate (B) α-Ketoglutarate
(C) ATP (D) NADH
21. All of the following are allosteric enzymes
except
(A) Citrate synthetase
(B) a-Ketoglutarate dehdrogenase
(C) Succinate thiokinase
(D) Succinate dehydrogenase
22. All of the following are intermediates of
citric acid cycle except
(A) Oxalosuccinate (B) Oxaloacetate
(C) Pyruvate (D) Fumarate
23. All of the following intermediates of citric
acid cycle can be formed from amino acids
except
(A) α-Ketoglutarate (B) Fumarate
(C) Malate (D) Oxaloacetate
24. Glycolytic pathway is located in
(A) Mitochondria (B) Cytosol
(C) Microsomes (D) Nucleus
25. End product of aerobic glycolysis is
(A) Acetyl CoA (B) Lactate
(C) Pyruvate (D) CO2 and H2O
26. During fasting, glucose is phosphorylated
mainly by
(A) Hexokinase (B) Glucokinase
(C) Both (A) and (B) (D) None of these
27. Glucokinase is found in
(A) Muscles (B) Brain
(C) Liver (D) All of these
28. In anaerobic glycolysis, energy yield
from each molecule of glucose is
(A) 2 ATP equivalents (B) 8 ATP equivalents
(C) 30 ATP equivalents(D) 38 ATP equivalents
29. Which of the following is an allosteric
enzyme?
(A) Phosphohexose isomerase
(B) Phosphotriose isomerase
(C) Lactate dehydrogenase
(D) Phosphofructokinase
30. Glycolysis is anaerobic in
(A) Liver (B) Brain
(C) Kidneys (D) Erythrocytes
