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All the protofilaments of a microtubule have the same _____________

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All the protofilaments of a microtubule have the same _____________

(a) polarity

(b) pH

(c) fluorescence

(d) torque
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The correct answer is (a) polarity

The best I can explain: All protofilaments of a microtubule have the same polarity, with alpha-tubulin at one end and beta-tubulin at the other. The entire polymer of microfilament is polar in nature.
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