Which one is a water-soluble protein?
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → Albumin
Proteins are classified by the shape of their molecules into two types:
Fibrous proteins: the polypeptide chains run side by side and are held together by hydrogen and disulphide bonds, giving fibre-like structures. They are generally insoluble in water. Examples: keratin (hair, wool, silk), myosin (muscles), collagen (tendons, skin).
Albumin, found in egg white and blood plasma, is a globular protein, so it is the water-soluble protein.
Why the other options are incorrect
Option (1) Myosin — Incorrect. A fibrous protein of muscles; insoluble in water.
Option (3) Keratin — Incorrect. The fibrous protein of hair, wool and nails; insoluble in water.
Option (4) Collagen — Incorrect. The fibrous protein of tendons, cartilage and skin; insoluble in water (on boiling it gives gelatin).
NCERT (2026-27 edition):
Globular Proteins
