Multiple Choice Questions on Enzymes – NEET Biology

Multiple Choice Questions on Enzymes – NEET Biology

Question 1. As the temperature changes from 30 to 45’c the rate of enzyme activity will:

1. Decrease
2. First decrease and then increase
3. First increase and then decrease
4. Increase.

Answer: 3. First increase and then decrease

Question 2. Which one inactivates an enzyme by changing the enzyme’s shape?

1. Non-competitive inhibitor
2. Competitive inhibitor.
3. Coenzyme
4. All the above.

Answer: 1. Non-competitive inhibitor

Question 3. A non-proteinic enzyme is :

1. Lysozyme
2. Zymase
3. Papain
4. Rna ase-p.

Answer: 4. Rna ase-p.

Question 4. Which of the following belongs to class 5 of the cubic system of classification of enzymes?

1. Isomerase
2. Ligases
3. Transferase
4. Lyases.

Answer: 1. Isomerase

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Question 5. Which does inactivate by denaturation in it?

1. Allosteric inhibitor
2. Competitive inhibitor
3. Irreversible inhibitor
4. None of the above.

Answer: 1. Allosteric inhibitor

Question 6. Most of the enzymes are secreted in an inactive form, otherwise, they will be destroyed.

1. Cell proteins
2. Cell dna
3. Cell mitochondria
4. Cell wall and membrane.

Answer: 1. Cell proteins

Multiple Choice Questions On Enzymes Neet

Question 7. The fastest enzyme is :

1. Pepsin
2. Trypsin
3. Catalase
4. Carbonic anhydrase.

Answer: 4. Carbonic anhydrase.

Question 8. Buchner isolated

1. Siamese
2. Zymase
3. Zeatinase
4. Ferment.

Answer: 2. Zymase

Question 9. The best example of extracellular enzymes (exoenzymes) is:

1. Nucleases
2. Digestive enzymes
3. Succinic dehydrogenase
4. None of the above.

Answer: 2. Digestive enzymes

Question 10. Enzymes bring about hydrolysis of esters and peptides are :

1. Transferases
2. Lyases
3. Hydrolases
4. Ligase.

Answer: 3. Hydrolases

Question 11. Examples of amine online are:

1. Arginase
2. Lactase
3. Zymase
4. Lipase.

Answer: 1. Arginase

Question 12. Energy must be added to a chemical reaction to start. This energy is known as the energy of :

1. Entropy
2. Activation
3. Enthalpy
4. Oxidation.

Answer: 2. Activation

Multiple Choice Questions On Enzymes Neet

Question 13. Which level of ‘x’ represents the usable energy yield?

1. 1
2. 2
3. 3
4. 4.

Answer: 2. 2

Question 14. Which segment of ‘x’ represents the energy of activation?

1. 1
2. 2
3. 4
4. 4

Answer: 1. 1

Question 15. The chemical reaction shown in the world be accelerated by all of the following processes:

1. Heating A and b together
2. Applying pressure to a and b
3. Adding an appropriate catalyst
4. Increase the conc. Of c.

Answer: 4. Increase the conc. Of c.

Question 16. In most of the metabolic pathways, all needed enzymes are arranged together, in a multienzyme complex within:

1. Solution of atp
2. Membrane
3. Quarternary protein
4. Coenzyme.

Answer: 2. Membrane

Question 17. A non-protein organic part attached firmly to an apoenzyme is called :

1. Cofactor
2. Activator
3. Metallic group
4. Coenzyme.

Answer: 1. Cofactor

Enzyme Catalysis Mcqs For Neet

Question 18. Which is an enzyme that joins two segments of replicated dna?

1. Ligase
2. Lyase
3. Endonuclease
4. None of the above.

Answer: 1. Ligase

Question 19. Apoenzyrne and coenzyme collective produce :

1. Holoenzyme
2. Enzyrne-product complex
3. Cofactor
4. Prosthetic group.

Answer: 1. Holoenzyme

Question 20. Minimum number of amino acids to make an enzyme is:

1. 50
2. 150
3. 500
4. 5000.

Answer: 1. 50

Question 21. Fmn and fad are coenzymes derived from :

1. Ascorbic acid
2. Riboflavin
3. Thiamine
4. Pyridoxine.

Answer: 1. Ascorbic acid

Question 22. Enzymes differ from inorganic catalysts in having:

1. High diffusion rate
2. High-temperature requirement
3. Proteinaceous structure
4. Tendency to become inactivated.

Answer: 3. Proteinaceous structure

Question 23. Active sites of enzymes are composed of :

1. Sugm molecule
2. Metallic ions
3. Organic co-factors
4. Amino acids.

Answer: 4. Amino acids.

Question 24. Pepsin best works at :

1. Ph 7.00
2. Ph 8.5
3. Ph.00
4. Ph 8.00.

Answer: 3. Ph.00

Enzyme Catalysis Mcqs For Neet

Question 25. Of the following chemicals, the one that is classified as an enzyme is :

1. Galactose
2. Lipids
3. Manganese dioxide
4. Protease.

Answer: 4. Protease.

Question 26. Ribozyme is :

1. Rna without sugar
2. Rna with extra phosphate
3. Rna having enzymatic activity
4. All of the above.

Answer: 3. Rna having enzymatic activity

Questions Question 27. Allenzymes:

1. Are amino acids
2. Act best at 60ºc
3. Act best at 7 ph
4. Are proteins.

Answer: 4. Are proteins.

Enzyme Catalysis Mcqs For Neet

Question 28. At high temperatures, the enzyme is :

1. Denaturated
2. Killed
3. Slightly activated
4. Inactivated.

Answer: 1. Denaturated

Question 29. Inorganic catalyst attached to an enzyme is :

1. Apoenzyme
2. Coenzyme
3. Inhibitor
4. Activator.

Answer: 4. Activator.

Question 30. Enzymes are polymers of :

1. Fatty acids
2. Amino acids
3. Hexose sugar
4. Inorganic phosphate.

Answer: 2. Amino acids

Question 31. One is not correct :

1. All enzymes are thermolabile
2. All enzymes are biocatalysts
3. All enzymes are proteins
4. All proteins are enzymes.

Answer: 4. All proteins are enzymes.

Enzymes Mcq For Neet

Question 32. Match the tennis in column 1 with suitable terms in column 2

Which of the following is correct?

1. 1-G, 2-E, 3-A, 4-B, 5-F,6-C
2. 1-G, 2-E, 3-B, 4-C, 5-D, 6-F
3. 1-G, 2-A, 3-D, 4-F, 5-B, 6-A
4. 1-G, 2-E, 3-D, 4-B, 5-4 5-F.

Answer: 3. 1-G, 2-A, 3-D, 4-F, 5-B, 6-A

Question 33. Modulation:

1. Inhibit enzyme activity
2. Stimulate enzyme activity
3. Function as coenzymes
4. Both 1 and 2.

Answer: 4. Both a and b

Question 34. K. Indicates :

1. Competitive inhibition
2. Denaturation of enzymes
3. Reaction velocity
4. All of these.

Answer: 3. Reaction velocity

Enzymes Mcq For Neet

Question 35. Which is susceptible to feedback inhibition?

1. Zymogen
2. Zymase
3. Glucokinase
4. Hexokinase.

Answer: 4. Hexokinase.

Question 36. Ribozyme was discovered by :

1. Kuhne
2. Because
3. Cech at all
4. Altman at all

Answer: 3. Cech at all.

Question 37. An enzyme that brings about a change in side group without altered composition:

1. Isomerase
2. Epimease
3. Mutase
4. Esterase.

Answer: 3. Mutase

Question 38. Enzymes functional in cells are:

1. Inducible, constitutive, and repressible
2. Inducible and repressible
3. Inducible only
4. Repressible on1y.

Answer: 1. Inducible, constitutive, and repressible

Question 39. Flavoproteins in cellular oxidation are called:

1. Splitting enzyme
2. Redox enzyme
3. Uricolytic enzyme
4. Yellow enzyme.

Answer: 4. Yellow enzyme.

Question 40. The presence of enzymes in the urine is called :

1. Enzymuria
2. Enzymopenia
3. Enzymopathy
4. None of the above.

Answer: 1. Enzymuria

Question 41. Elisa test used in detecting:

1. Antigen
2. Antibody
3. Hormone
4. All of the above.

Answer: 4. All of the above.

Question 42. A person suffering from a.tr.d.s is a resident of an area that is exposed to radio waves which test is preferred to detect h.i.v. Infection.

1. R.i.a (radio immune assay)
2. H.i.v. Test.
3. E.l.i.s.a. Test
4. All of the above.

Answer: 3. E.l.i.s.a. Test

Neet Biology Enzyme Classification Mcqs

Question 43. Which of the following curve profiles show changes in the velocity (v) of an enzyme-catalyzed reactions at different pH values :

Answer: 1. 

Question 44. According to Koshland:

1. The enzyme is never destroyed
2. The enzyme is a rigid molecule
3. The catalytic site of the enzyme is rigid
4. Catalytic sites can be influenced by the presence of substrate.

Answer: 4. Catalytic sites can be influenced by the presence of substrate.

Enzymes MCQ Objective Questions  Question 45. According to Michaelis constant, the value of v is expressed as

1. [Latex]v=\frac{v_{\max } \times(s)}{k_m+(s)}[/latex]
2. [Latex]v=\frac{k_m+(s)}{v_{\max } \times(s)}[/latex]
3. [Latex]\mathrm{v}=\frac{\mathrm{v}_{\max } \times \mathrm{k}_{\mathrm{m}}}{[\mathrm{s}]}[/latex]
4. [Latex]\mathrm{v}=\frac{\mathrm{k}_{\mathrm{m}} \times(\mathrm{s})}{\mathrm{v}_{\max }} .[/Latex]

Answer: 2. [Latex]v=\frac{k_m+(s)}{v_{\max } \times(s)}[/latex]

Question 46. Enzymes catalyzing the hydrolysis of ester and peptide by the addition of water are known as:

1. Transferases
2. Hydrolases
3. Isomerases
4. Oxidation-reduction enzymes.

Answer: 2. Hydrolases

Question 47. Model of fisher implies that;

1. The active site is flexible and adjusts to the substrate
2. The active site requires the removal of PO, group
3. The active site is complementary in shape to that of the substrate
4. None of the above.

Answer: 3. The active site is complementary in shape to that of the substrate.

Question 48. C-amp mediated “cascade model” of enzyme regulation was proposed by :

1. Fisher
2. Sutherland
3. Sumner
4. Koshalnd.

Answer: 2. Sutherland

Question 49. The substrate combines more rapidly with the enzyme when:

1. Km is high
2. Km is low
3. Ki is high
4. Ki is low.

Answer: 2. Km is low