What are microtubules primarily composed of?

Where does microtubule nucleation primarily occur within the cell?

A microtubule is observed to grow at one end while shrinking at the other. Which process is this an example of?

Which of the following best describes the function of microtubules in the cell?

What is the initial step in microtubule growth?

What might occur if a cell's centrosomes are damaged during cell division?

Propose a mechanism by which centrioles could be targeted to inhibit cancer cell division.