Final answer:
The region of a chromosome where microtubules connect to a chromosome pair is called the centromere, and the kinetochores attach to microtubules at the centromere.
Step-by-step explanation:
The region of a chromosome where microtubules connect to a chromosome pair is called the centromere. Microtubules of the spindle apparatus attach to kinetochores located at the centromere of each chromosome. The centromere is a region on the chromosome; kinetochores are structures in that region.