https://youtube.com/shorts/mfYkJTllSi8?si=pLXBiIeruWXvZyPe _(For More WhatsApp https://wa.me/2349034537844)_ How many can you answer? 1. What is the optical rotation of sucrose before hydrolysis? a. Laevorotatory (–19.5°) b. Dextrorotatory (+62.5°) c. Laevorotatory (–55.2°) d. Dextrorotatory (+55.2°) Answer: b. Dextrorotatory (+62.5°) 2. Why are the hydrolytic products of sucrose laevorotatory? a. Due to presence of maltose b. Fructose has a greater specific laevorotation than glucose's dextrorotation c. Glucose has greater laevorotation d. Galactose dominates the rotation Answer: b. Fructose has a greater specific laevorotation than glucose's dextrorotation 3. What term is used for the mixture of glucose and fructose formed after sucrose hydrolysis? a. Invertase b. Dextrin c. Invert Sugar d. Reducing Sugar Answer: c. Invert Sugar 4. What is the process of changing the optical rotation after sucrose hydrolysis called? a. Neutralization b. Oxidation c. Reduction d. Inversion Answer: d. Inversion 5. What accounts for the high sweetness of honey? a. Presence of glucose b. High concentration of galactose c. Presence of fructose d. Presence of maltose Answer: c. Presence of fructose 6. What type of disaccharide is lactulose? a. Aldodisaccharide b. Ketodisaccharide c. Neutral disaccharide d. Phosphodisaccharide Answer: b. Ketodisaccharide 7. What is the structure of lactulose? a. O-β-D-glucopyranosyl-(1→4)-β-D-fructofuranose b. O-α-D-glucopyranosyl-(1→2)-β-D-fructofuranose c. O-α-D-galactopyranosyl-(1→4)-β-D-fructofuranose d. O-β-D-galactopyranosyl-(1→6)-α-D-glucopyranose Answer: c. O-α-D-galactopyranosyl-(1→4)-β-D-fructofuranose 8. Where is lactulose found naturally in small amounts? a. Raw milk b. Heated milk c. Human saliva d. Cheese Answer: b. Heated milk 9. How is lactulose primarily obtained? a. Fermentation b. Naturally occurring c. Synthetically d. Extracted from meat Answer: c. Synthetically 10. Why is lactulose clinically significant? a. It is digested by intestinal enzymes b. It forms mucic acid c. It is fermented by intestinal bacteria and used as osmotic laxative d. It reduces copper solutions Answer: c. It is fermented by intestinal bacteria and used as osmotic laxative 11. What sugar is used in food preparations for babies and invalids? a. Lactose b. Sucrose c. Maltose d. Fructose Answer: c. Maltose 12. What is the nutritional advantage of maltose-rich foods? a. High in fats b. Difficult to digest c. Easily digestible d. Contains galactose Answer: c. Easily digestible 13. Where is lactose synthesized in the body? a. Liver b. Stomach c. Lactating mammary gland d. Intestines Answer: c. Lactating mammary gland 14. What is the source of energy in breast milk for newborns? a. Glucose b. Sucrose c. Lactose d. Fructose Answer: c. Lactose 15. What test differentiates E. coli from Typhoid bacillus based on sugar fermentation? a. Mucic acid test b. Fearon’s test c. Lactose fermentation test d. Biuret test Answer: c. Lactose fermentation test 16. Which of the following bacteria ferments lactose? a. Typhoid bacillus b. Salmonella c. Coliform bacilli (E. coli) d. Shigella Answer: c. Coliform bacilli (E. coli) 17. What organisms sour milk by converting lactose to lactic acid? a. Typhoid bacilli b. E. coli, A. aerogenes, Str. lactis c. Candida albicans d. Mycobacterium Answer: b. E. coli, A. aerogenes, Str. lactis 18. What effect does parenterally introduced sucrose have? a. Easily digested b. Stored as glycogen c. Alters blood osmotic condition d. Fermented by coliforms Answer: c. Alters blood osmotic condition 19. In which condition is sucrose used parenterally? a. Anaemia b. Obesity c. Oedema, like cerebral oedema d. Diabetes Answer: c. Oedema, like cerebral oedema 20. What can happen if disaccharides are not hydrolysed in the gut? a. Vomiting b. Constipation c. Diarrhoea d. Fever Answer: c. Diarrhoea 21. What is another name for lactose? a. Cane sugar b. Table sugar c. Milk sugar d. Grape sugar Answer: c. Milk sugar 22. What is another name for sucrose? a. Milk sugar b. Starch c. Cane sugar d. Glucose Answer: c. Cane sugar 23. What are the constituent monosaccharides of lactose? a. Glucose and fructose b. Glucose and galactose c. Galactose and fructose d. Two glucose molecules Answer: b. Glucose and galactose 24. What type of linkage is present in lactose? a. α 1→2 b. β 1→4 c. α 1→6 d. β 1→1 Answer: b. β 1→4 25. What are the hydrolysis products of lactose? a. Glucose and fructose b. Glucose and galactose c. Galactose and sucrose d. Fructose and maltose Answer: b. Glucose and galactose 26. What enzyme hydrolyses lactose? a. Sucrase b. Maltase c. Invertase d. Lactase Answer: d. Lactase 27. What enzyme hydrolyses sucrose? a. Sucrase (Invertase) b. Lactase c. Amylase d. Glucosidase Answer: a. Sucrase (Invertase) 28. What is the optical rotation of lactose solution? a. –19.5° b. +66.5° c. +55.2° d. 0° Answer: c. +55.2° 29. Why can't sucrose exhibit mutarotation? a. It is laevorotatory b. Both anomeric carbons are involved in linkage c. It lacks a free aldehyde d. It contains galactose Answer: b. Both anomeric carbons are involved in linkage 30. Which sugar can reduce alkaline copper sulphate solution? a. Sucrose b. Fructose c. Lactose d. Cellulose Answer: c. Lactose 31. Can sucrose reduce Benedict’s or Fehling’s solution? a. Yes b. Only Fehling’s c. No d. Only Benedict’s Answer: c. No 32. Do either lactose or sucrose reduce Barfoed’s solution? a. Both do b. Lactose only c. Sucrose only d. Neither Answer: d. Neither 33. What is the appearance of lactosazone crystals? a. Needle-like b. Rhomboid c. Hedgehog or Powder puff d. Sunflower Answer: c. Hedgehog or Powder puff 34. Which sugar forms mucic acid after treatment with conc. HNO₃? a. Sucrose b. Lactose c. Glucose d. Maltose Answer: b. Lactose 35. Which sugar gives positive Fearon’s test? a. Sucrose b. Lactose c. Glucose d. Fructose Answer: b. Lactose 36. Where is lactose synthesised in the human body? a. Liver b. Mammary gland c. Kidney d. Pancreas Answer: b. Mammary gland 37. In which physiological state might lactose appear in urine? a. Diabetes b. Fasting c. Lactating mother d. Fever Answer: c. Lactating mother