Which of the following statements about the structure of microtubules is false?
(a) Microtubules are built from protofilaments that come together to make a hollow structure.
(b) The two ends of a protofilament are chemically distinct, with a-tubulin exposed at one end and ß-tubulin exposed at the other end.
(c) Within a microtubule, all protofilaments are arranged in the same orientation, giving the microtubule structural polarity.
(d) a-Tubulin and ß-tubulin are covalently bound to make the tubulin dimer that then assembles into protofilaments.
Answer:
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