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Compare and contrast structure of microtubules and microfilaments.

Microtubules

-long strings of protein tubulin

-dimer of alpha and beta tubulin

-both subunits bind to a single molecule of GTP

-beta-tubulin GTP may be hydrolyzed into GDP and phosphate

-alphas remain bound

- alpha is at either end of the dimer

-multiple tubules assemble end to end

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