1. Biochemistry is the study of chemicals present in:
A) Living organisms
B) Rocks
C) Metals
D) Atmosphere
2. Carbohydrates are mainly composed of:
A) Carbon and nitrogen
B) Carbon, hydrogen and oxygen
C) Hydrogen and nitrogen
D) Oxygen and sulfur
3. The basic building blocks of proteins are:
A) Fatty acids
B) Glucose molecules
C) Amino acids
D) Vitamins
4. Which biomolecule stores maximum energy?
A) Proteins
B) Vitamins
C) Carbohydrates
D) Fats
5. Glucose is a:
A) Simple sugar
B) Protein
C) Fat
D) Vitamin
6. Enzymes are chemically:
A) Carbohydrates
B) Proteins
C) Fats
D) Minerals
7. The deficiency of vitamin C causes:
A) Rickets
B) Night blindness
C) Scurvy
D) Beriberi
8. Which carbohydrate is commonly known as table sugar?
A) Sucrose
B) Glucose
C) Starch
D) Cellulose
9. Fats are insoluble in:
A) Ether
B) Benzene
C) Chloroform
D) Water
10. Which vitamin helps in blood clotting?
A) Vitamin A
B) Vitamin K
C) Vitamin C
D) Vitamin D
11. The deficiency of vitamin D causes:
A) Rickets
B) Scurvy
C) Beriberi
D) Anemia
12. Starch is a:
A) Protein
B) Fat
C) Carbohydrate
D) Vitamin
13. Which vitamin is obtained from sunlight?
A) Vitamin A
B) Vitamin D
C) Vitamin C
D) Vitamin K
14. DNA stands for:
A) Deoxy Nitric Acid
B) Double Nucleic Acid
C) Deoxy Natural Acid
D) Deoxyribonucleic Acid
15. The main function of carbohydrates is to provide:
A) Energy
B) Protection
C) Hormones
D) Minerals
16. Which biomolecule is essential for body growth and repair?
A) Carbohydrates
B) Vitamins
C) Proteins
D) Water
17. The deficiency of vitamin A causes:
A) Rickets
B) Night blindness
C) Scurvy
D) Goiter
18. Which biomolecule acts as biological catalyst?
A) Enzymes
B) Vitamins
C) Hormones
D) Fats
19. Which carbohydrate is present in plant cell walls?
A) Glucose
B) Sucrose
C) Starch
D) Cellulose
20. Proteins are made up of:
A) Sugars
B) Amino acids
C) Fatty acids
D) Glycerol
21. The deficiency of vitamin B1 causes:
A) Scurvy
B) Rickets
C) Beriberi
D) Night blindness
22. RNA stands for:
A) Ribonucleic Acid
B) Reactive Nucleic Acid
C) Ribo Natural Acid
D) Reduced Nucleic Acid
23. Which nutrient provides insulation to the body?
A) Proteins
B) Carbohydrates
C) Vitamins
D) Fats
24. Which vitamin is important for healthy bones?
A) Vitamin C
B) Vitamin D
C) Vitamin A
D) Vitamin K
25. The simplest carbohydrate is:
A) Starch
B) Cellulose
C) Glucose
D) Protein
26. Which nutrient is the main structural material of muscles?
A) Proteins
B) Fats
C) Vitamins
D) Minerals
27. Which vitamin prevents scurvy?
A) Vitamin A
B) Vitamin B
C) Vitamin D
D) Vitamin C
28. Fats are composed of glycerol and:
A) Amino acids
B) Fatty acids
C) Sugars
D) Vitamins
29. Which biomolecule contains nitrogen?
A) Proteins
B) Fats
C) Carbohydrates
D) Starch
30. The storage carbohydrate in plants is:
A) Cellulose
B) Glycogen
C) Starch
D) Maltose
31. Glycogen is stored in:
A) Plants only
B) Bacteria only
C) Fungi only
D) Animals
32. Which vitamin helps maintain healthy eyesight?
A) Vitamin C
B) Vitamin A
C) Vitamin D
D) Vitamin K
33. Which biomolecule is insoluble in water?
A) Fats
B) Glucose
C) Sucrose
D) Starch
34. The deficiency of iodine causes:
A) Rickets
B) Beriberi
C) Goiter
D) Scurvy
35. Which nutrient is the major source of energy?
A) Proteins
B) Carbohydrates
C) Vitamins
D) Minerals
36. Which vitamin deficiency causes weak bones?
A) Vitamin A
B) Vitamin B
C) Vitamin C
D) Vitamin D
37. Enzymes speed up biochemical reactions by lowering:
A) Activation energy
B) Temperature
C) Pressure
D) Mass
38. Which carbohydrate is called milk sugar?
A) Sucrose
B) Maltose
C) Lactose
D) Glucose
39. Which nutrient helps in tissue repair?
A) Fats
B) Proteins
C) Vitamins
D) Water
40. Which vitamin is water soluble?
A) Vitamin A
B) Vitamin D
C) Vitamin K
D) Vitamin C
41. The hereditary material in living organisms is:
A) DNA
B) Protein
C) Fat
D) Enzyme
42. Which nutrient provides thermal insulation?
A) Vitamins
B) Carbohydrates
C) Fats
D) Minerals
43. Which vitamin deficiency causes night blindness?
A) Vitamin C
B) Vitamin A
C) Vitamin D
D) Vitamin K
44. Which carbohydrate is stored in animal liver?
A) Glycogen
B) Cellulose
C) Sucrose
D) Maltose
45. Which vitamin is fat soluble?
A) Vitamin C
B) Vitamin B
C) Both B and C
D) Vitamin A
46. Which nutrient is required in the smallest quantity?
A) Proteins
B) Carbohydrates
C) Vitamins
D) Fats
47. The process of digestion mainly involves:
A) Oxidation
B) Enzymatic reactions
C) Neutralization
D) Combustion
48. Which biomolecule forms cell membranes?
A) Lipids
B) Carbohydrates
C) Vitamins
D) Minerals
49. Which sugar is directly absorbed into blood?
A) Sucrose
B) Lactose
C) Maltose
D) Glucose
50. Biochemistry mainly combines biology with:
A) Physics
B) Mathematics
C) Chemistry
D) Geography