9th class Biology Chapter no.6 MCQs
Unit no.6 MCQs of 9th Class Biology
Enzymes:
1. What is true about co factors?
a. Increase activation energy
b. Break hydrogen bonds in protein
c. Are composed of protein
d. Help Facilitate enzyme activity
2. To what category of molecules do enzymes belong?
a. Nucleic acids
b. Carbohydrates
c. Proteins
d. Lipids
3. The optimum temperature for working of human enzymes is:
a. 37°C
b. 58°C
c. 40°C
d. 10°C
4. The molecules at which enzymes act are called:
a. Catalyst
b. Products
c. Enzymes
d. Substrates
5. Enzyme used for cleaning utensils is:
a. Lipase
b. Amylase
c. Tylon
d. Trypsin
6. The name of enzyme used in dish washing is:
a. Amylase
b. Protease
c. Pepsin
d. Lipase
7. Enzyme pepsin works in:
a. Enzyme pepsin works in:
b. Mouth
c. Stomach
d. Intestine
8. The concept of metabolism was first of all given by
a. Ibn-e- Nafees
b. Kuhne
c. Emil fisher
d. Koshland
9. The term metabolism is derived from which language?
a. German
b. Latin
c. Arabic
d. Greek
10. The biochemical reactions in which larger molecules are synthesized, are called:
a. Metabolism
b. Anabolism
c. Enzymatic reaction
d. Catabolism
11. All biochemical reactions occurring in living organisms necessary for life are called as:
a. Catabolism
b. Metabolism
c. Mutalism
d. Anabolism
12. Who used the term enzyme first time?
a. W- Fleming
b. Oscar Hurtwig
c. T.H Morgan
d. Winhelm Kuhne
13. Almost all enzymes are:
a. Carbohydrates
b. Protein
c. Fats
d. Vitamins
14. Chemically enzymes are:
a. Lipids
b. Protein
c. Fats
d. Carbohydrates
15. Structurally enzymes are made of:
a. Vitamins
b. Minerals
c. Fats
d. Amino acids
16. When organic co factors are tightly bound to enzyme?
a. Co factors
b. Co enzymes
c. Prosthetic group
d. Appoenzyme
17. The catalytic region of enzyme is called:
a. Co enzyme
b. Active site
c. Metabolic site
d. Cofactor
18. An enzyme, which breaks down starch is:
a. Trypsin
b. Protease
c. Lipase
d. Amylase
19. Vitamin acts as co enzymes is:
a. Vitamin C
b. Vitamin B
c. Riboflavin
d. Vitamin D
20. Trypsin enzyme shows its activity at:
a. Low pH
b. Medium pH
c. Acidic pH
d. High pH
21. Who proposed lock and key model for action of enzyme?
a. W – Kuhne
b. Daniel Koshland
c. W –Fleming
d. Emil Fischer
22. In protein metabolism, ……… works as a catalyst:
a. Pepsin
b. Amylase
c. Protease
d. Lipase
23. Who presented induced fit model?
a. Abn-e- Nafees
b. Daniel Koshlann
c. Jabir bin Hayyan
d. Emil Fisher
24. Emil Fisher introduced lock and key model in:
a. 1994
b. 1894
c. 1890
d. 1794
25. The compounds which converts inactive pepsinogen into pepsin is called:
a. Water
b. Lipase
c. HCl
d. Mucus
26. When did Daniel Koshland purpose induced Fit model?
a. 1968
b. 1894
c. 1985
d. 1958
27. What is true about enzymes?
a. They are not very specific in their choice of substrate
b. They make biochemical reactions to proceed spontaneously
c. They are needed in large quantities
d. They lower the activation energy of a reaction
28. Alcohol is prepared by:
a. Onion
b. Yeast
c. Pepper
d. Algae
29. In which medium enzyme trypsin works?
a. Neutral
b. Alkaline
c. Slight basic
d. Acidic
30. Enzymes used for removal of protein stains from clothes is called:
a. Protease
b. Pepsin
c. Lipase
d. Amylase
31. Which of the following acts as catalyst for metabolism?
a. Lipids
b. Enzymes
c. Protein
d. Vitamin
32. Enzyme lipase acts only on:
a. Carbohydrates
b. Lipids
c. Hormones
d. Proteins
33. Biological detergent is:
a. Riboflavin
b. Protease enzyme
c. Thiamine
d. Pepsin
34. Lipase enzyme acts on:
a. Glucose
b. Lipids
c. Starch
d. Proteins
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