Question

Which protein is present in muscle?

• A. Myosin
• B. Keratin
• C. Serin
• D. Cellulose

Hint:

Muscle movement = Actin + Myosin. Always remember, myosin is the muscle protein responsible for contraction.

Answer 1

The Correct Option is A

Myosin is a motor protein that plays a key role in muscle contraction. It interacts with another protein called actin to enable the sliding filament mechanism that drives muscle movement. Explanation of other options:

• (B) Keratin is found in hair, nails, and skin — not involved in muscle movement.
• (C) Serin (Serine) is an amino acid, not a structural protein in muscles.
• (D) Cellulose is a carbohydrate found in plant cell walls — not a protein.