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| 01 | 9th Class Biology Mcqs Chapter 01 | 02 | 9th Class Biology Mcqs Chapter 02 |
| 03 | 9th Class Biology Mcqs Chapter 03 | 04 | 9th Class Biology Mcqs Chapter 03 |
| 05 | 9th Class Biology Mcqs Chapter 05 | 06 | 9th Class Biology Mcqs Chapter 06 |
| 07 | 9th Class Biology Mcqs Chapter 07 | 08 | 9th Class Biology Mcqs Chapter 08 |
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| 11 | 9th Class Biology Mcqs Chapter 11 | 12 | 9th Class Biology Mcqs Chapter 12 |
CHAPTER 6
ENZYMES
Encircle the most appropriate answer from the following options
1. The term metabolism is derived from:
(a) Greek word
(b) Latin Word
(c) Italian word
(d) French word
2. The term Metabolism is derived from the Greek words means:
(a) Split
(b) Change
(c) Division
(d) Break
3. The concept of metabolism was first of all given by:
(a) Ibn-e-Nafees
(b) Winhelm Kuhne
(c) Emil Fischer
(d) Daniel Koshland
4. Which among of the following statements is not true about enzymes?
(a) They act as biocatalysts
(b) Enzymes speed up biochemical reactions
(c) They lower the activation energy
(d) They increase the activation energy
5. Chemically enzymes are:
(a) Protein
(b) Carbohydrates
(c) Lipids
(d) Fats
6. To which group of molecules enzymes belong?
(a) Carbohydrates
(b) Proteins
(c) Nucleic acids
(d) Lipids
7. The molecules on which enzymes act are called:
(a) Substrates
(b) Co-enzyme
(c) Proteins
(d) Enzyme substrates complex
8. Enzymes lower the activation energy in the ways:
(a) They may alter the shape of substrate
(b) Some enzymes do so by disrupting the charge distribution on substrates
(c) They may lower activation energy by bringing substrates in the correct orientation to react
(d) All of these
9. Almost all the enzymes are:
(a) Vitamins
(b) Protein
(c) Carbohydrates
(d) Fats
10. When the term enzyme was used for the first time?
(a) 1874
(b) 1876
(c) 1878
(d) 1880
11. Who first time used the term enzyme?
(a) Winhelm Kuhne
(b) Daniel Koshland
(c) Emil Fischer
(d) Ibn-e-Nafees
12. The catalytic region of enzyme is called:
(a) Cofactor
(b) Coenzyme
(c) Prosthetic group
(d) Active site
13. If organic cofactors are tightly bound to enzyme, they are called:
(a) Coenzymes
(b) Prosthetic groups
(c) Both a & b
(d) None of these
14. If organic cofactors are loosely attached with enzyme, they are called:
(a) Coenzymes
(b) Prosthetic groups
(c) Both a & b
(d) None of these
15. Which one is an organic cofactor?
(a) Flavin
(b) Heme
(c) Both a & b
(d) None of these
16. Which of the following vitamins act as coenzyme?
(a) Riboflavin
(b) Thiamine
(c) Folic acid
(d) All of these
17. The enzymes used for the removal of protein stains from clothes?
(a) Protease
(b) Amylase
(c) Lipase
(d) All of these
18. Which among the following enzymes are used in dish washing to remove resistant starch residues?
(a) Protease
(b) Amylase
(c) Lipase
(d) All of these
19. The optimum temperature for the maximum working speed of human enzymes is:
(a) 35°C
(b) 37°C
(c) 39°C
(d) 43°C
20. When there is an increase in temperature, the rate of enzyme catalyzed reactions:
(a) Increases
(b) Decreases
(c) Remains constant
(d) All of these
21. Number of discovered enzymes so far:
(a) 1000
(b) 1500
(c) 2000
(d) 2500
22. Who proposed lock and key model?
(a) Winhelm Kuhne
(b) Daniel Koshland
(c) Emil Fischer
(d) Ibn-e-Nafees
23. Who proposed the induced-fit model?
(a) Winhelm Kuhne
(b) Ibn-e-Nafees
(c) Emil Fischer
(d) Daniel Koshland
24. When was lock and key model proposed?
(a) 1894
(b) 1896
(c) 1898
(d) 1890
25. When was induced-fit model proposed?
(a) 1952
(b) 1954
(c) 1956
(d) 1958
26. Which of the following is not true about induced fit model?
(a) This model explains specificity of enzymes
(b) It is more acceptable model
(c) According to this model active site isn’t rigid structure
(d) Active site is molded into the required shape.
27. Starch is broken down by an enzyme called:
(a) Lipase
(b) Pepsin
(c) Amylase
(d) All of these
28. The enzyme that acts on lipids:
(a) Protease
(b) Lipase
(c) Amylase
(d) Pepsin
29. The peptide bonds in proteins are broken down by:
(a) Protease
(b) Lipase
(c) Amylase
(d) All of these