Question:
Site of ATPase activity in cilia and flagella is:
Site of ATPase activity in cilia and flagella is:
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Dynein arms are the motor units responsible for ciliary and flagellar movement.
Updated On: Jun 19, 2026
- Microtubules
- Dynein arms
- Inner sheath
- Outer sheath
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The Correct Option is B
Solution and Explanation
Step 1: Understand cilia and flagella structure.
Cilia and flagella are motile cell organelles composed of a 9+2 arrangement of microtubules.
Step 2: Identify movement mechanism.
Movement is generated by sliding of microtubules powered by ATP hydrolysis.
Step 3: Role of dynein.
Dynein is a motor protein present in the arms of microtubules that has ATPase activity.
Step 4: ATP hydrolysis function.
ATPase activity in dynein converts ATP into energy required for bending motion.
Step 5: Eliminate other options.
Microtubules provide structure, not enzymatic activity; sheath structures are supportive.
Step 6: Conclusion.
Therefore, ATPase activity is located in dynein arms.
Cilia and flagella are motile cell organelles composed of a 9+2 arrangement of microtubules.
Step 2: Identify movement mechanism.
Movement is generated by sliding of microtubules powered by ATP hydrolysis.
Step 3: Role of dynein.
Dynein is a motor protein present in the arms of microtubules that has ATPase activity.
Step 4: ATP hydrolysis function.
ATPase activity in dynein converts ATP into energy required for bending motion.
Step 5: Eliminate other options.
Microtubules provide structure, not enzymatic activity; sheath structures are supportive.
Step 6: Conclusion.
Therefore, ATPase activity is located in dynein arms.
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