Final answer:
The micrometer spindle contains two kinds of microtubules: kinetochore microtubules, which attach to the kinetochores of chromosome centromeres; and non-kinetochore microtubules, which help organize and segregate chromosomes during cell division.
Step-by-step explanation:
On the micrometer spindle, there are two kinds of microtubules involved in cell division: kinetochore microtubules and non-kinetochore microtubules. Kinetochore microtubules attach to the kinetochore, which is associated with the centromeres of the chromosomes, and play a crucial role in separating the chromosomes during mitosis and meiosis. The spindle apparatus stretches from the kinetochores to the polar centrioles at opposite ends of the dividing cell, helping to organize and segregate the chromosomes. Microtubules are essentially the the structural framework within the cell that provide the means for chromosomes to move during cell division.