Food Enzymology MCQs 50 Score: 0 Attempted: 0/50 1. Enzymes are chemically: (A) Lipids (B) Proteins (C) Carbohydrates (D) VitaminsShow All Answers 2. The substance upon which an enzyme acts is called: (A) Product (B) Reactant (C) Catalyst (D) Substrate 3. The inactive form of an enzyme is called: (A) Apoenzyme (B) Coenzyme (C) Zymogen (D) Holoenzyme 4. The protein part of an enzyme is known as: (A) Apoenzyme (B) Coenzyme (C) Prosthetic group (D) Substrate 5. The complete active enzyme with its cofactor is called: (A) Holoenzyme (B) Apoenzyme (C) Cofactor (D) Catalyst 6. Enzymes speed up reactions by: (A) Increasing activation energy (B) Reducing substrate (C) Lowering activation energy (D) Breaking bonds randomly 7. Which of the following enzymes breaks down starch? (A) Protease (B) Lipase (C) Amylase (D) Maltase 8. The enzyme used in cheese making is: (A) Rennin (B) Trypsin (C) Pepsin (D) Lipase 9. Optimum temperature for most enzymes in food processing is around: (A) 25°C (B) 37°C (C) 50°C (D) 10°C 10. The enzyme that hydrolyzes fats is: (A) Amylase (B) Protease (C) Lactase (D) Lipase 11. The pH at which an enzyme works best is called its: (A) Maximum point (B) Minimum pH (C) Optimum pH (D) Activation pH 12. Which enzyme converts sucrose into glucose and fructose? (A) Invertase (B) Maltase (C) Lactase (D) Amylase 13. The enzyme used to tenderize meat is: (A) Papain (B) Amylase (C) Lactase (D) Catalase 14. Enzyme activity is affected by: (A) Temperature (B) pH (C) Substrate concentration (D) All of these 15. Enzymes are destroyed at high temperatures because of: (A) Hydrolysis (B) Denaturation (C) Oxidation (D) Coagulation 16. The enzyme that decomposes hydrogen peroxide is: (A) Oxidase (B) Lipase (C) Catalase (D) Protease 17. Enzymes that transfer hydrogen atoms are known as: (A) Transferases (B) Lyases (C) Ligases (D) Oxidoreductases 18. Which of the following is a hydrolase enzyme? (A) Amylase (B) Isomerase (C) Ligase (D) Synthase 19. Enzymes that act outside the cell are called: (A) Endoenzymes (B) Exoenzymes (C) Intracellular enzymes (D) Structural enzymes 20. Which of the following is not an enzyme? (A) Urease (B) Trypsin (C) Pepsin (D) Hemoglobin 21. The enzyme responsible for curd formation in milk is: (A) Lactase (B) Lipase (C) Rennin (D) Amylase 22. Coenzymes are usually derived from: (A) Minerals (B) Vitamins (C) Proteins (D) Fats 23. Enzyme that catalyzes the conversion of glucose to glucose-6-phosphate is: (A) Kinase (B) Dehydrogenase (C) Isomerase (D) Synthase 24. The enzyme involved in alcoholic fermentation is: (A) Zymase (B) Amylase (C) Lactase (D) Lipase 25. Which enzyme is used in bread making? (A) Amylase (B) Pepsin (C) Catalase (D) Protease 26. The first enzyme discovered was: (A) Lipase (B) Catalase (C) Pepsin (D) Amylase 27. Enzyme that causes browning in fruits and vegetables is: (A) Catalase (B) Amylase (C) Protease (D) Polyphenol oxidase 28. The enzyme that digests proteins in the stomach is: (A) Amylase (B) Pepsin (C) Lipase (D) Lactase 29. Enzymes are sensitive to: (A) Radiation (B) pH (C) Temperature (D) All of the above 30. Enzymes that catalyze removal of a group without hydrolysis are: (A) Lyases (B) Transferases (C) Isomerases (D) Ligases 31. The enzyme used for glucose syrup production from starch is: (A) Amylase (B) Invertase (C) Glucoamylase (D) Protease 32. Enzyme that converts milk sugar into glucose and galactose is: (A) Lactase (B) Amylase (C) Maltase (D) Lipase 33. The non-protein part of an enzyme required for activity is called: (A) Substrate (B) Apoenzyme (C) Inhibitor (D) Coenzyme 34. The enzyme used in juice clarification is: (A) Lipase (B) Protease (C) Pectinase (D) Catalase 35. The optimum pH for pepsin activity is: (A) 7.0 (B) 8.0 (C) 2.0 (D) 5.0 36. Enzyme inhibitors that compete with substrate are called: (A) Non-competitive inhibitors (B) Competitive inhibitors (C) Reversible inhibitors (D) Allosteric inhibitors 37. The enzyme lipoxygenase causes: (A) Oxidation of lipids (B) Hydrolysis of proteins (C) Breakdown of sugars (D) None of these 38. The enzyme used in beer production to break down starch is: (A) Amylase (B) Catalase (C) Lipase (D) Protease 39. Enzymes are highly specific because of their: (A) Molecular weight (B) Active site structure (C) Solubility (D) pH value 40. Which of the following enzymes is used in detergents? (A) Protease (B) Amylase (C) Lipase (D) All of these 41. The enzyme that converts starch into dextrin is: (A) Alpha-amylase (B) Beta-amylase (C) Glucoamylase (D) Invertase 42. Enzymes that catalyze oxidation-reduction reactions are: (A) Transferases (B) Ligases (C) Oxidoreductases (D) Hydrolases 43. Which enzyme removes oxygen from food systems? (A) Glucose oxidase (B) Catalase (C) Lipase (D) Polyphenol oxidase 44. Enzyme that causes rancidity in fats is: (A) Amylase (B) Lipase (C) Pepsin (D) Catalase 45. The enzyme responsible for softening of fruits during ripening is: (A) Pectinase (B) Amylase (C) Lipase (D) Protease 46. The enzyme used in glucose isomerization is: (A) Lipase (B) Amylase (C) Catalase (D) Glucose isomerase 47. The enzyme that hydrolyzes proteins to peptides is: (A) Lipase (B) Amylase (C) Protease (D) Catalase 48. Which factor does not affect enzyme activity? (A) Temperature (B) pH (C) Light intensity (D) Substrate concentration 49. Enzymes act as: (A) Inhibitors (B) Catalysts (C) Reactants (D) Promoters 50. The branch of science dealing with enzymes is called: (A) Enzymology (B) Biology (C) Chemistry (D) Biophysics