The microtubules in the cytoskeleton are made up of the protein:
Correct answer: C. Tubulin
- A. Tropomyosin
- B. Myosin
- C. Tubulin
- D. Actin
Explanation
Microtubules are cylindrical structures in the cytoskeleton made of tubulin protein, which assembles into long, hollow tubes. These structures are crucial for maintaining cell shape, enabling intracellular transport, and facilitating cell division. Tubulin is the only protein in this list that forms microtubules. Tropomyosin, myosin, and actin are all involved in muscle contraction and cell movement but do not form microtubules. Tropomyosin stabilizes actin filaments, myosin interacts with actin for muscle contraction, and actin forms microfilaments, another component of the cytoskeleton.
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About Support and Movement
Support and movement covers the axial and appendicular skeleton, bone structure, joints and the arrangement of skeletal muscles. Muscle contraction is explained through actin, myosin, sliding filaments, calcium ions and ATP, while arthritis is distinguished as a disorder of joints rather than a normal part of movement.
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