Questions and Answers
What is the composition of a microtubule?
Polymers of α-tubulin and β-tubulin
What gives microtubules their polarity?
The orientation of their subunits
How many parallel protofilaments compose a microtubule?
13
What forms the helical microtubule lattice?
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What is the process in which several tubulin molecules interact to form a microtubule seed?
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What is the change from growth to shrinkage of individual microtubules called?
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What tends to force the protofilament into a curved shape that is less able to pack into the microtubule wall?
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Where are microtubules generally nucleated from?
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What do Microtubule associated proteins (MAPs) like Map2 and Tau do?
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What is the structure composed of two centrioles and surrounded by a dense mass of protein termed the pericentriolar material?
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What causes the end of a protofilament to grow in a linear conformation that assembles into the cylindrical wall of the microtubule?
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What is the process in which individual microtubules alternate between cycles of growth and shrinkage called?
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