Test Your Knowledge| Biology MCQs on the Fundamentals of Enzymes for Board and Entry Exams
Welcome to our blog post on Biology Class IX level MCQs on Fundamentals of Enzymes for Board Exams and Entry Tests! Enzymes are an essential topic in biology, as they play a vital role in many metabolic processes within our bodies. For students preparing for exams such as BISE, Federal Board Examinations, MDCAT, NEET, ETEA, CSS, and PMS, having a strong understanding of enzymes is crucial for success.
In this article, we will be covering MCQs on Enzymes that will help you get extra marks in your exams. These MCQs cover essential topics such as metabolism and its types, the mechanism of enzyme action, activation energy, definitions of a substrate and active site, factors affecting the rate of enzyme, enzyme specificity according to the Lock and Key Model, and the Induced fit model. By covering these MCQs, you will not only be able to score well in your exams, but you will also gain a better understanding of the fundamental concepts of enzymes.
So, whether you are preparing for your board exams or entry tests, this article will help you get the extra marks you need to shine in your results. Let's get started!
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- For Long and Comprehensive Answers on this chapter Click Here
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| Important Biology MCQs on Enzymes From the MCQs Library of H.E.S (Health, Education, and Skills) |
MCQs on Basic Terms and Definitions
1. What is metabolism?
A. The formation of large molecules
B. The breakdown of large molecules
C. The sum of all chemical reactions in living organisms
D. The process of producing energy in the body
2. What is anabolism?
A. The breakdown of large molecules
B. The sum of constructive and destructive processes
C. The process of producing energy in the body
D. The combination of small molecules to form large molecules
3. What is catabolism?
A. The breakdown of large molecules
B. The combination of small molecules to form large molecules
C. The sum of constructive and destructive processes
D. The process of producing energy in the body
4. What type of reaction is responsible for the formation of proteins in our body?
A. Catabolic reaction
B. Anabolic reaction
C. Destructive process
D. Constructive process
5. What happens to the fats in our body during physical exercise?
A. They break down into smaller units of fats.
B. They combine to form larger molecules.
C. They remain unchanged.
D. They are excreted from the body.
6. What are metabolic pathways?
A. A series of random reactions in the body
B. A series of reactions that proceed in an orderly step-by-step manner
C. A process in which enzymes are not involved
D. A process that occurs instantly
7. What is the role of enzymes in metabolic pathways?
A. To slow down the rate of reaction
B. To stop the reaction from occurring
C. To change the order of reactions
D. To speed up the rate of biochemical reactions
MCQs on Characteristics of Enzymes
8. Which of the following is a characteristic of enzymes?A. They are inorganic molecules
B. They are not involved in biochemical reactions
C. They slow down the rate of reactions
D. They are organic catalysts
9. How many enzymes are present in a cell?
A. 100-200
B. 500-1000
C. 2000-3000
D. 5000-6000
10. How do enzymes lower the activation energy needed for a reaction to occur?
A) By increasing the temperature of the reaction
B) By increasing the concentration of the reactants
C) By providing a surface for the reactants to bind to
D) By providing an alternative pathway for the reaction
11. What is the consequence of disrupted metabolic processes due to a lack of enzymes?
A) Enhanced cellular processes
B) Normal cellular processes
C) Disease or death
D) Growth and development
12. What is the role of enzymes in chemical reactions?
A. They increase the energy of activation
B. They decrease the energy of activation
C. They have no effect on the energy of activation
D. They stop the chemical reactions
13. What is the active site in enzymes?
A. The region where enzymes are produced
B. The region where cofactors bind
C. The region where substrates fit
D. The region where suppressors bind
14. What is a substrate?
A. The molecules that fit in the active site
B. The region where cofactors bind
C. The region where enzymes are produced
D. The region where inhibitors bind
15. What is the function of activators?
A. To start enzyme activity
B. To stop enzyme activity
C. To alter the shape of enzymes
D. None of the above
16. What is the function of inhibitors?
A. To start enzyme activity
B. To stop enzyme activity
C. To alter the shape of enzymes
D. None of the above
17. What are cofactors?
A. Molecules that join enzymes
B. Molecules that make enzymes functional
C. Atoms and groups of atoms that alter the shape of enzymes
D. All of the above
18. What is a prosthetic group?
A. An organic cofactor
B. An inorganic cofactor
C. A substrate
D. An activator
19. What are coenzymes?
A. Molecules that join enzymes
B. Molecules that make enzymes functional
C. Atoms and groups of atoms that alter the shape of enzymes
D. All of the above
20. Where do many coenzymes come from?
A. Vitamins and minerals
B. Fruits and vegetables
C. Meat and dairy products
D. None of the above
21. What happens in the absence of coenzymes?
A. Enzymes become more active
B. Enzymes become less active
C. Enzymes stop working
D. None of the above
22. What are intracellular enzymes?
B. Enzymes that initiate enzyme activity
C. Enzymes that catalyze one kind of chemical reaction
D. Enzymes found inside the living cells
23. What is an example of an extracellular enzyme?
A. NAD+
B. FAD+
C. Lipase
D. Zinc
MCQs on factors affecting the rate of enzymes activity
24. Which factor affects enzyme activity in a direct manner?
A. PH
B. Concentration of substrate
C. Enzyme-to-substrate ratio
D. Temperature
25. At what temperature do human enzymes have their optimum activity?
A. 20-25°C
B. 30-35°C
C. 35-40°C
D. 45-50°C
26. What happens to enzyme activity at very high temperatures?
A. Enzyme activity increases
B. Enzyme activity remains constant
C. Enzyme activity decreases
D. Enzyme activity stops completely
27. Which of the following is not a result of a change in the optimal pH range for enzyme activity?
A. Enzyme activity stops
B. The breakdown of weak ionic bonds
C. The breakdown of hydrogen bonds
D. The formation of peptide bonds
28. At what pH does pepsin work best?
A. 2
B. 6
C. 8
D. 10
29. What is the optimal pH range for enzyme activity?
A. 2-4
B. 4-6
C. 6-8
D. 8-10
30. What is the relationship between substrate concentration and enzyme activity?
A. Direct
B. Inverse
C. No relationship
D. Random
31. When does enzyme saturation occur?
A. When the concentration of substrate is very low
B. When the concentration of enzyme is very high
C. When the active site of all enzyme molecules is occupied most of the time
D. When the enzyme becomes denatured
32. Which of the following is not a result of enzyme denaturation?
A. A change in the protein's structure
B. Breakdown of weak ionic bonds
C. Loss of enzyme activity
D. Increase in enzyme activity
33. Which factor can act as an enzyme activator or inhibitor?
A. Concentration of substrate
B. Temperature
C. PH
D. Cofactors
34. What is meant by enzyme specificity?
A. Each enzyme can speed up any chemical reaction
B. Each enzyme recognizes and reacts with its own substrate
C. Enzymes are not specific for any substrate
D. Enzymes can only catalyze one reaction in the body
MCQs on Lock and Key Model, and Induced Fit Model
35. What is the induced fit model?A. Enzyme and substrate act as lock and key
B. Enzyme structure changes after substrate binding
C. Enzyme and substrate have a flexible relationship
D. Enzyme and substrate are not related at all
36. What is the role of an enzyme in the lock and key model?
A. The enzyme acts as a key
B. The enzyme acts as a lock
C. The enzyme helps the substrate change shape
D. The enzyme catalyzes the reaction
37. What is the role of an enzyme in the induced fit model?
A. The enzyme acts as a key
B. The enzyme acts as a lock
C. The enzyme helps the substrate change shape
D. The enzyme catalyzes the reaction
38. What happens when a substrate fits into the shape of an enzyme in the lock and key model?
A. Chemical changes occur in the enzyme
B. Chemical changes occur in the substrate
C. Chemical changes occur in both the enzyme and substrate
D. No chemical changes occur
39. What is an example of an enzyme with specificity for converting proteins into amino acids?
A. Protease
B. Catalase
C. Lipase
D. Amylase
40. Which model of enzyme specificity is more widely accepted nowadays?
A. Lock and key model
B. Induced fit model
C. Flexible model
D. Substrate-specific model
41. What happens if the enzyme is not specific for its substrate?
A. The reaction will occur
B. The reaction will not occur
C. The reaction will occur slowly
D. The enzyme will become denatured
42. What is the effect of enzyme concentration on enzyme specificity?
A. Higher enzyme concentration results in higher specificity
B. Lower enzyme concentration results in higher specificity
C. Enzyme concentration has no effect on specificity
D. Enzyme concentration determines the type of substrate
43. What is the effect of substrate concentration on enzyme specificity?
A. Higher substrate concentration results in higher specificity
B. Lower substrate concentration results in higher specificity
C. Substrate concentration has no effect on specificity
D. Substrate concentration determines the type of enzyme
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