MCQs in Carbohydrate Metabolism
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1 MCQs in Carbohydrate Metabolism 1. Which mammalian cell does not have aerobic pathway of glucose catabolism? (a) Nerve cell (b) Sperm cell (c) Ovum (d) Red cell 2. In aerobic glycolysis, glucose is first broken down to pyruvate and then to CO2 and H2O in the Kreb's cycle; but in anaerobic glycolysis it does not stop at pyruvate but forms lactate. Why? (a) Because pyruvate is toxic in larger concentration. (b) Because pyruvate can form amino acid animation. (c) Because pyruvate can form glucose back. (d) Because this allows the regeneration of NAD from NADH2 which is formed in earlier step of glycolysis thus assuring continuation glycolysis. 3. Which of the following step is not involved in substrate level phosphorylation? (a) Dihydroxyacetone phosphate Glyceraldehyde- 3- phosphate. (b) 1,3- diphosphoglycerate 3-phosphoglycerate. (c) Succinyl CoA Succinate. (d) Phosphoenol pyruvate pyruvate. 4. How many ATP molecules are produced in the citric acid cycle itself? (a) One (b) Two (c) Twelve (d) Fifteen 5. CO2 is not produced in the reaction catalysed by the enzyme. (a) Pyruvate dehydrogenase (b) Succinate dehydrogenase (c) Isocitrate dehydrogenase (d) α- ketoglutarate dehydrogenase. 6. What is the main aim of citric acid cycle? (a) To produce energy from carbohydrates.
2 (b) To provide keto acids for synthesis of amino acids. (c) To completely oxidise acetyl CoA to CO2 and H2O with complete release of energy. (d) To synthesize acids to maintain ph. 7. Which of the following statements is not true of HMP shunt pathway? (a) CO2 is not produced in it. (b) NADPH is produced. (c) Pentoses are produced. (d) Does not produce ATP. 8. The utilize fructose but not glucose. (a) Ovum (b) Spermatozoa (c) Adipose tissue (d) Mammary gland. 9. Neoglucogenesis occurs predominantly from the following compounds except. (a) Lactate (b) Fatty acids (c ) Glycerol (d) Amino acids 10. The uronic acid pathway is unique as it provides to man. (a) Ascorbic acid (b) Xylulose (c) Glucuronic acid (d) All of these. 11. The hormone does not stimulate hepatic glycogenolysis. (a) Thyroxine (b) Adrenaline (c ) Glucagon (d) Cortisol 12. Suggest a test to distinguish a case of renal glycosuria from diabetic glycosuria. (a) Bendict's test (b) Blood sugar (c) Urine sugar (d) GTT.
3 13. NADPH serves to regenerate in red cells to prevent their lysis. (a) Cholesterol (b) Glutathione (c ) NADP (d) Cysteine 14. The G-6-PD deficiency causes hemolytic anemia due to lack of. (a) NADPH (b) NADP (c) Pentoses (d) Cholesterol. 15. How many ATP molecules are produced on complete oxidation of acetyl CoA in the citric acid cycle? (a) Six (b) Nine (b) Twelve (d) Fifteen. 16. Which acid acts as a carrier molecule in citric acid cycle? (a) Citric acid (b) Oxaloacetic acid (c ) Succinic acid (d) Isocitric acid. 17. Which of the following compound is not a substrate for gluconeogenesis pathway? (a) Glycerol (b) Lactate (c) Oxaloacetate (d) Glycogen 18. Which of the following enzyme is not involved in gluconeogenesis? (a) Pyruvate carboxylase (b) Phosphoenol pyruvate (c) Carboxykinase (d) Hexokinase. 19. The most important initial source of blood glucose during fasting is. (a) Muscle glycogen (b) Muscle protein (c) Liver Triglyceride (d) Liver glycogen
4 20. The major fate of glucose- 6- phosphate in tissues in a well-fed state is. (a) Hydrolysis of glucose (b) Conversion to glycogen (c) Isomerisation to fructose- 6- phosphate (d) Conversion to ribulose -5- phosphate 21. The major fuel for the brain after prolonged starvation is. (a)glucose (b) Fatty acids (c) Ketone bodies (d) Glycerol 22. The monosaccharide most rapidly absorbed from the intestine is. (a) Glucose (b) Fructose (c) Mannose (d) Galactose 23. Which of the following is not a polymer of glucose? (a) Glycogen (b) Cellulose (c) Amylose ( d) Inulin 24. Lactose intolerance is due to- (a) ADH deficiency (b) Deficiency of bile (c) Lactase deficiency (d) Malabsorption syndrome 25. In contrast to liver, muscle glycogen does not contribute directly to blood glucose level because: (a) Muscles lack glucose -6- phosphatase (b) Muscles contain no glucokinase (c) Muscles lack glycogen (d) Muscles contain no glycogen phosphorylase 26. Which of the following statement is true regarding the α- amylase? (a) Breaks glucose from one end of the carbohydrate
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