Question:
Cross bridges between peripheral microtubules of cilia and flagella are made up of motor protein ___________.
Cross bridges between peripheral microtubules of cilia and flagella are made up of motor protein ___________.
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Dynein arms are responsible for the bending movement of cilia and flagella.
Updated On: Mar 28, 2026
- Myosin
- Actin
- Dynein
- Keratin
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The Correct Option is C
Solution and Explanation
Step 1: Understanding cilia and flagella structure.
Cilia and flagella possess a 9 + 2 arrangement of microtubules. The peripheral microtubules are connected by cross-bridges that help in movement.
Step 2: Role of dynein.
Dynein is a motor protein that forms cross-bridges between adjacent microtubules and generates sliding movements using ATP.
Step 3: Analysis of options.
(A) Myosin: Incorrect — involved in muscle contraction.
(B) Actin: Incorrect — forms microfilaments, not microtubule bridges.
(C) Dynein: Correct — motor protein of cilia and flagella.
(D) Keratin: Incorrect — structural protein of epithelial cells.
Step 4: Conclusion.
The cross-bridges are made up of the motor protein dynein.
Cilia and flagella possess a 9 + 2 arrangement of microtubules. The peripheral microtubules are connected by cross-bridges that help in movement.
Step 2: Role of dynein.
Dynein is a motor protein that forms cross-bridges between adjacent microtubules and generates sliding movements using ATP.
Step 3: Analysis of options.
(A) Myosin: Incorrect — involved in muscle contraction.
(B) Actin: Incorrect — forms microfilaments, not microtubule bridges.
(C) Dynein: Correct — motor protein of cilia and flagella.
(D) Keratin: Incorrect — structural protein of epithelial cells.
Step 4: Conclusion.
The cross-bridges are made up of the motor protein dynein.
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