The microtubules' stated cause is
To aid the process of mitosis:
Its mighty forces to compel
Formation of a brand new cell.
Along the microtubules' trail
Move chromosomes, and without fail,
When all are where to be they ought'er
The cell splits into Mom and Daughter.
So -
Unless the tiny tubes unravel
The chromosomes' compelling travel,
And point the genes the proper way,
We wouldn't last another day!...
But they have still another task,
A very lofty, if you ask:
They may be lacking in elan,
But they help with your retirement plan...