MCQOPTIONS
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MCQOPTIONS
This section includes 48 Mcqs, each offering curated multiple-choice questions to sharpen your Enzyme Reaction knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
This statement about enzymes is true |
| A. | enzymes accelerate reactions by lowering the activation energy |
| B. | enzymes are proteins whose three-dimensional form is key to their function |
| C. | enzymes do not alter the overall change in free energy for a reaction |
| D. | all of these |
| Answer» E. | |
| 2. |
The enzyme COX-1 is vital for human health in this way: |
| A. | it is a chemical derivative of aspirin |
| B. | catalyzes the hormone-production which maintains the stomach lining |
| C. | critical for the biosynthesis of DNA |
| D. | helps in the transportation of carbon dioxide in the blood |
| Answer» C. critical for the biosynthesis of DNA | |
| 3. |
Tryptophan synthetase of E.coli, a typical bifunctional oligomeric enzyme consists of |
| A. | a protein A and one subunit A |
| B. | a protein designated A |
| C. | two proteins designated A and B |
| D. | a protein designated B |
| Answer» D. a protein designated B | |
| 4. |
This Enzyme was First Isolated and Purified in the Form of Crystals: |
| A. | Urease |
| B. | pepsin |
| C. | Amylase |
| D. | Ribonuclease |
| Answer» B. pepsin | |
| 5. |
Which Among the Given Count Determine the Synthesis of One Enzyme: |
| A. | One |
| B. | Four |
| C. | Eight |
| D. | Sixteen |
| Answer» B. Four | |
| 6. |
In Alcoholism, this Enzyme is Elevated by Which Mean: |
| A. | acid phosphatase |
| B. | B. |
| C. | C. |
| D. | |
| E. | glutamyl transpeptidase |
| Answer» E. glutamyl transpeptidase | |
| 7. |
Which Among the Following is the Nature of Enzyme: |
| A. | Lipid |
| B. | Vitamin |
| C. | Carbohydrate |
| D. | Protein |
| Answer» E. | |
| 8. |
Which Value is Needed for Enzyme Action: |
| A. | Low Km |
| B. | Low Ki |
| C. | High Km |
| D. | High Ki |
| Answer» C. High Km | |
| 9. |
The Enzyme Which Hydrolyses Starch to Maltose is: |
| A. | Protease |
| B. | Amylase |
| C. | Lactase |
| D. | Maltase |
| Answer» C. Lactase | |
| 10. |
Catalyst are Different from Enzymes: |
| A. | Functional at high temperature |
| B. | B. |
| C. | C. |
| D. | |
| E. | Having high rate diffusion |
| Answer» C. C. | |
| 11. |
Enzymes are Polymers of: |
| A. | Hexose sugar |
| B. | Amino acids |
| C. | Fatty acids |
| D. | D. |
| Answer» C. Fatty acids | |
| 12. |
Enzymes are Basically Made Up of: |
| A. | Fats |
| B. | Proteins |
| C. | Nucleic acids |
| D. | Vitamins |
| Answer» C. Nucleic acids | |
| 13. |
Zymogen or Proenzyme is a : |
| A. | Modulator |
| B. | Vitamin |
| C. | Enzyme precursor |
| D. | Hormone |
| Answer» D. Hormone | |
| 14. |
Enzyme Catalysing Rearrangement of Atomic Grouping without Altering Molecular Weight or Number of Atom is: |
| A. | Ligase |
| B. | Isomerase |
| C. | Oxidoreductase |
| D. | Hydrolase |
| Answer» C. Oxidoreductase | |
| 15. |
Enzyme Complex Involved in Alcoholic Fermentation is: |
| A. | Zymase |
| B. | Invertase |
| C. | Lipase |
| D. | Amylase |
| Answer» B. Invertase | |
| 16. |
Blocking of Enzyme Action by Blocking its Active Site is Called as: |
| A. | Allosteric inhibition |
| B. | Feedback inhibition |
| C. | Competitive inhibition |
| D. | Non-competitive inhibition |
| Answer» D. Non-competitive inhibition | |
| 17. |
Diastase Take Part in Digestion of of Which One: |
| A. | Protein |
| B. | Starch |
| C. | Amino acids |
| D. | Fat |
| Answer» C. Amino acids | |
| 18. |
Which One Among them is the Example of Competitive Inhibition of an Enzyme: |
| A. | Succinic dehydrogenase by malonic acid |
| B. | Cytochrome oxidase by cyanide |
| C. | Hexokinase by glucose-6-phosphate |
| D. | Carbonic anhydrase by carbon dioxide |
| Answer» B. Cytochrome oxidase by cyanide | |
| 19. |
Which of the Following is Produced with the Combination of Apoenzyme and Coenzyme: |
| A. | Holoenzyme |
| B. | Enzyme substrate complex |
| C. | Prosthetic group |
| D. | Enzyme product complex |
| Answer» B. Enzyme substrate complex | |
| 20. |
An Enzyme that Joins the Ends of Two Strands of Nucleic Acid is: |
| A. | Polymerase |
| B. | ligase |
| C. | synthetase |
| D. | Helicase |
| Answer» C. synthetase | |
| 21. |
The General Mechanism is that an Enzyme Acts By: |
| A. | Reducing the activation energy |
| B. | Increasing activation energy |
| C. | Decreasing pH value |
| D. | Increasing the pH value |
| Answer» B. Increasing activation energy | |
| 22. |
The Coenzyme is: |
| A. | Often a metal |
| B. | always a protein |
| C. | often a vitamin |
| D. | always an inorganic compound |
| Answer» B. always a protein | |
| 23. |
Zn +2 is an Inorganic Activator for Enzyme: |
| A. | Carbonic anhydrase |
| B. | Phosphatase |
| C. | Chymotrypsin |
| D. | Maltase |
| Answer» D. Maltase | |
| 24. |
Mg +2 is an Inorganic Activator for Enzymes: |
| A. | Phosphatase |
| B. | Carbonic anhydrase |
| C. | C. |
| D. | D. |
| Answer» B. Carbonic anhydrase | |
| 25. |
Which Among them is not Attribute of Enzymes: |
| A. | Specific in nature |
| B. | Protein in chemistry |
| C. | Consumed in reaction |
| D. | Increased rate of reaction |
| Answer» D. Increased rate of reaction | |
| 26. |
An Uncatalyzed Reaction Involved: |
| A. | High activation energy |
| B. | B. |
| C. | C. |
| D. | D. |
| E. | |
| Answer» B. B. | |
| 27. |
Non Protein Component of Enzymes are Known as: |
| A. | Cofactor |
| B. | Activator |
| C. | Coenzyme |
| D. | All of these |
| Answer» E. | |
| 28. |
Which of the following reaction is catalyzed by Lyase? |
| A. | Breaking of bonds |
| B. | Formation of bonds |
| C. | Intramolecular rearrangement of bonds |
| D. | Transfer of group from one molecule to another |
| Answer» B. Formation of bonds | |
| 29. |
Name the enzyme secreted by pancreas? |
| A. | Pepsin |
| B. | Chymotrypsin |
| C. | Trypsin |
| D. | Alcohol dehydrogenase |
| Answer» D. Alcohol dehydrogenase | |
| 30. |
Name the enzyme which catalyzes the oxidation-reduction reaction? |
| A. | Transaminase |
| B. | Glutamine synthetase |
| C. | Phosphofructokinase |
| D. | Oxidoreductase |
| Answer» E. | |
| 31. |
Which of this vitamin is associated with the coenzyme Biocytin? |
| A. | Nicotinic acid |
| B. | Thiamine |
| C. | Biotin |
| D. | Pyridoxine |
| Answer» D. Pyridoxine | |
| 32. |
Name the coenzyme of riboflavin (B2)? |
| A. | NAD or NADP |
| B. | FAD and FMN |
| C. | Coenzyme A |
| D. | Thiamine pyrophosphate |
| Answer» C. Coenzyme A | |
| 33. |
What is an apoenzyme? |
| A. | It is a protein portion of an enzyme |
| B. | It is a non-protein group |
| C. | It is a complete, biologically active conjugated enzyme |
| D. | It is a prosthetic group |
| Answer» B. It is a non-protein group | |
| 34. |
What is the nature of an enzyme? |
| A. | Vitamin |
| B. | Lipid |
| C. | Carbohydrate |
| D. | Protein |
| Answer» E. | |
| 35. |
Enzyme increases the rate of reaction by lowering the activation energy. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 36. |
A __________is a biocatalyst that increases the rate of the reaction without being changed. |
| A. | Aluminum oxide |
| B. | Silicon dioxide |
| C. | Enzyme |
| D. | Hydrogen peroxide |
| Answer» D. Hydrogen peroxide | |
| 37. |
Which Among them is a Cofact: |
| A. | Inorganic ion |
| B. | Organic molecule |
| C. | Both A and B |
| D. | None of these |
| Answer» D. None of these | |
| 38. |
Optimum pH Value of Pepsin is: |
| A. | 1.4 |
| B. | 2 |
| C. | 3.5 |
| D. | 5 |
| Answer» E. | |
| 39. |
The Enzyme Minus its Coenzyme Known as: |
| A. | Apoenzyme |
| B. | Metalloenzyme |
| C. | Isoenzyme |
| D. | All of these |
| Answer» B. Metalloenzyme | |
| 40. |
In Human Body Optimum Temperature for Enzymatic Activities is: |
| A. | 37 degree celsius |
| B. | 25 degree celsius |
| C. | 20 degree celsius |
| D. | 15 degree celsius |
| Answer» B. 25 degree celsius | |
| 41. |
Koshland Proposed Which Model: |
| A. | Fluid mosaic model |
| B. | Induced fit model |
| C. | C. |
| D. | D. |
| E. | |
| Answer» C. C. | |
| 42. |
This Statement about Enzymes is True: |
| A. | Enzymes accelerate reactions by lowering activation energy |
| B. | Enzymes are proteins whose three-dimensional form is key to their function |
| C. | Enzymes do not alter the overall change in free energy for a reaction |
| D. | D. |
| E. | |
| Answer» E. | |
| 43. |
Macromolecule chitin is |
| A. | a simple polysaccharide |
| B. | sulphur containing polysaccharide |
| C. | phosphorous containing polysaccharide |
| D. | nitrogen containing polysaccharide |
| Answer» E. | |
| 44. |
This enzyme was first isolated and purified in the form of crystals |
| A. | Urease |
| B. | pepsin |
| C. | Amylase |
| D. | Ribonuclease |
| Answer» B. pepsin | |
| 45. |
With regards to enzyme action, this statement is incorrect |
| A. | Malonate is a competitive inhibitor of succinic dehydrogenase |
| B. | the substrate binds with the enzyme at its active site |
| C. | the non-competitve inhibitor binds the enzyme at a site distinct from that binding the substrate |
| D. | addition of a lot of succinates does not reverse the inhibition of succinic dehydrogenase by malonate |
| Answer» E. | |
| 46. |
In alcoholism, this enzyme is elevated |
| A. | acid phosphatase |
| B. | hepatitis |
| C. | serum glutamate pyruvate transaminase |
| D. | glutamyl transpeptidase |
| Answer» E. | |
| 47. |
The nature of an enzyme is |
| A. | Lipid |
| B. | Vitamin |
| C. | Carbohydrate |
| D. | Protein |
| Answer» E. | |
| 48. |
What is the count of genes that determine the synthesis of one enzyme? |
| A. | One |
| B. | Four |
| C. | Eight |
| D. | Sixteen |
| Answer» B. Four | |