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ENZYMES- Part 3
See all quizzes of ENZYMES- Part 3 here:
1 In acute pancreatitis, the enzyme raised
in first five days is
(A) Serum amylase
(B) Serum lactic dehydrogenase
(C) Urinary lipase
(D) Urinary amylase
2. Acute pancreatitis is characterised by
(A) Lack of synthesis of zymogen enzymes
(B) Continuous release of zymogen enzymes into
the gut
(C) Premature activation of zymogen enzymes
(D) Inactivation of zymogen enzymes
3. An example of functional plasma enzyme is
(A) Lipoprotein lipase
(B) Amylase
(C) Aminotransferase
(D) Lactate dehydrogenase
4. A non-functional plasma enzyme is
(A) Psudocholinesterase
(B) Lipoprotein lipase
(C) Proenzyme of blood coagulation
(D) Lipase
5. The pH optima for salivary analyse is
(A) 6.6–6.8 (B) 2.0–7.5
(C) 7.9 (D) 8.6
6. The pH optima for pancreatic analyse is
(A) 4.0 (B) 7.1
(C) 7.9 (D) 8.6
7. The pH optima for sucrase is
(A) 5.0–7.0 (B) 5.8–6.2
(C) 5.4–6.0 (D) 8.6
8. The pH optima for maltase is
(A) 1.0–2.0 (B) 5.2–6.0
(C) 5.8–6.2 (D) 5.4–6.0
9. The pH optima for lactase is
(A) 1.0-2.0 (B) 5.4–6.0
(C) 5.0–7.0 (D) 5.8–6.2
10. The substrate for amylase is
(A) Cane sugar (B) Starch
(C) Lactose (D) Ribose
11. The ion which activates salivary amylase
activity is
(A) Chloride (B) Bicarbonate
(C) Sodium (D) Potassium
12. The pancreatic amylase activity is increased
in the presence of
(A) Hydrochloric acid (B) Bile salts
(C) Thiocyanate ions (D) Calcium ions
13. A carbohydrate which can not be digested
in human gut is
(A) Cellulose (B) Starch
(C) Glycogen (D) Maltose
14. The sugar absorbed by facilitated
diffusion and requiring Na independent
transporter is
(A) Glucose (B) Fructose
(C) Galactose (D) Ribose
15. In the intestine the rate of absorption is
highest for
(A) Glucose and galactose
(B) Fructose and mannose
(C) Fructose and pentose
(D) Mannose and pentose
16. Glucose absorption is promoted by
(A) Vitamin A (B) Thiamin
(C) Vitamin C (D) Vitamin K
17. The harmone acting directly on intestinal
mucosa and stimulating glucose absorption
is
(A) Insulin (B) Glucagon
(C) Thyroxine (D) Vasopressin
18. Given that the standard free energy
change (ΔG°) for the hydrolysis of ATP is
–7.3 K cal/mol and that for the hydrolysis
of Glucose 6-phosphate is –3.3 Kcal/mol,
the ΔG° for the phosphorylation of
glucose is Glucose + ATP → Glucose 6–
Phosphate + ADP.
(A) –10.6 Kcal/mol (B) –7.3 Kcal/mol
(C) –4.0 Kcal/mol (D) +4.0 Kcal/mol
19. At low blood glucose concentration, brain
but not liver will take up glucose. It is due
to the
(A) Low Km of hexokinase
(B) Low Km of glucokinase
(C) Specificity of glucokinase
(D) Blood brain barrier
20. In the reaction below, Nu TP stands for
NuTP + glucose → Glucose 6–Phosphate
+ NuDP.
(A) ATP (B) CTP
(C) GTP (D) UTP
21. In the figures shown below, fructose 1,6-
biphosphate is located at point:
(A) A (B) B
(C) C (D) D
22. The enzyme of the glycolic pathway,
sensitive to inhibiton by fluoride ions is
(A) Hexokinase (B) Aldolase
(C) Enolase (D) Pyruvate kinase
23. In glycolytic pathway, iodacetate inhibits
the activity of the enzyme:
(A) Phosphotriose isomerase
(B) Glyceraldehyde-3-phosphate dehydrogenase
(C) Pyruvate kinase
(D) Phosphofructokinase
24. In the glycolytic pathway, enolpyruvate
is converted to ketopyruvate by
(A) Pyruvate kinase
(B) Phosphoenolpyruvate
(C) Pyruvate dehydrogenase
(D) Spontaneously
25. In erythrocytes, 2, 3-biphosphoglycerate
is derived from the intermediate:
(A) Glyeraldehyde-3-phosphate
(B) 1, 3-Biphosphoglycerate
(C) 3-Phosphoglycerate
(D) 2-Phosphoglycerate
26. 2, 3-Biphosphoglycerate in high concentrations,
combines with hemoglobin,
causes
(A) Displacement of the oxyhemoglobin
dissociation curve to the left
(B) Displacement of the oxyhemoglobin
dissociation curve to the right
(C) No change in oxy hemoglobin dissociation curve
(D) Increased affinity for oxygen
27. Erythrocytes under normal conditions and
microorganisms under anaerobic conditions
may accumulate
(A) NADPH
(B) Pyruvate
(C) Phosphoenolpyruvate
(D) Lactate
28. Enzymes leading to the high energy
phosphorylation of substrates during
glycolysis include which of the following?
(A) Phosphoglycerate kinase
(B) Enolase
(C) Pyruvate Kinase
(D) Glyceraldehyde-3-phosphate dehydrogenase
29. Lineweaver – Burk double reciprocal plot
is related to
(A) Substrate concentration
(B) Enzyme activity
(C) Temperature
(D) Both (A) and (B)
30. Phosphofructokinase key enzyme in
glycolysis is inhibited by
(A) Citrate and ATP (B) AMP
(C) ADP (D) TMP
