Microtubules, the hollow fibres of the cytoskeleton and of cilia, are built from the protein
Correct answer: B. tubulin
- A. actin
- B. tubulin
- C. myosin
- D. keratin
Explanation
Tubulin dimers polymerise into hollow tubes that form the cytoskeleton, spindle fibres, cilia and flagella. Actin makes the thinner microfilaments of muscle and cell cortex, and keratin is an intermediate filament protein of hair and skin.
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