Question: 158. What is the main function of the spindle fibers during mitosis?
(1) To separate the chromosomes
(2) To synthesize new DNA
(3) To repair damaged DNA
(4) To regulate cell growth
Answer: Option (1)
Explanation:
Spindle fibers are formed from microtubules during mitosis. Their primary role is to attach to the centromeres of chromosomes via the kinetochore and pull the sister chromatids apart.
During anaphase, spindle fibers shorten, ensuring that each daughter cell receives an identical set of chromosomes. They do not participate in DNA synthesis, DNA repair, or regulation of cell growth.
Thus, the main function of spindle fibers is to separate the chromosomes.