Question: what is the difference between microtubules and spindle fibers?
Answer: They are the same thing. As the others have written, microtubules are a “track” that can move organelles around when “motor” proteins (that cleave ATP) pull those organelles. The spindle is what moves the chromosomes during mitosis and meiosis. ... Spindle fibers are used in cell division, and are made of microtubules.