Question:
Which of the following protein can convert chemical energy in the ATP molecules into mechanical energy?
Which of the following protein can convert chemical energy in the ATP molecules into mechanical energy?
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Motor proteins like myosin are essential for intracellular movement and muscle contraction through ATP hydrolysis.
Updated On: Jun 19, 2026
- Actin
- Myosin
- Troponin
- Tropomyosin
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The Correct Option is B
Solution and Explanation
Step 1: Muscle contraction mechanism.
Muscle contraction requires conversion of chemical energy (ATP) into mechanical energy to produce movement of muscle fibers.
Step 2: Role of myosin.
Myosin is a motor protein with ATPase activity. It binds ATP, hydrolyzes it, and uses the energy to change conformation and pull actin filaments.
Step 3: Actin as track.
Actin filaments provide a track for myosin movement; actin itself does not convert chemical energy.
Step 4: Troponin and tropomyosin.
These proteins regulate muscle contraction by controlling access of myosin to actin, but they do not convert ATP to mechanical energy.
Step 5: Conclusion.
Hence, Myosin is the protein that converts chemical energy in ATP into mechanical energy for muscle contraction.
Muscle contraction requires conversion of chemical energy (ATP) into mechanical energy to produce movement of muscle fibers.
Step 2: Role of myosin.
Myosin is a motor protein with ATPase activity. It binds ATP, hydrolyzes it, and uses the energy to change conformation and pull actin filaments.
Step 3: Actin as track.
Actin filaments provide a track for myosin movement; actin itself does not convert chemical energy.
Step 4: Troponin and tropomyosin.
These proteins regulate muscle contraction by controlling access of myosin to actin, but they do not convert ATP to mechanical energy.
Step 5: Conclusion.
Hence, Myosin is the protein that converts chemical energy in ATP into mechanical energy for muscle contraction.
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