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Eduncle posted an MCQ
October 18, 2019 • 22:49 pm 0 points
  • CSIR NET
  • Life Sciences

A single protofilament of microtubules grows at the speed of 2. Consider that there is no catastrophe in the microtubule nucleation and the size of the tubulin

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    Eduncle Best Answer

    Each microtubule is made up of 13 protofilament. Each protofilament is made up of tubulin unit. Size of a tubulin unit is 5 nm. As per the question the rate of elongation of a single protofilament is 2 um/min or 2000 nm/min.
    So, the number of tubulin units added per min to elongate a single protofilament = rate of elongation (nm/min) / length of tubulin unit (nm)
    = 2000 / 5 = 400
    So, for single protofilament elongation per min 400 tubulin units are added.
    hence, for the entire microtubule which is made up of 13 protofilaments, total number of tubulin units required to be added per min = 400 × 13 = 5200

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