Q: Which of the following is true of kinetochores?

• 1
  They are the primary centrosome structures that maintain the attachment of the sister chromatids prior to mitosis.
• 2
  They are the sites at which microtubules attach to chromosomes.
• 3
  They are located at the center of the centrosome and organize tubulin into spindle fibers.
• 4
  They cross at the cell's equator and move against each other, causing the cell to elongate.