What is the function of the spindle fibers during cell division?

The function of spindle fibers during cell division is to separate chromosomes. Spindle fibers are part of the mitotic spindle, which forms during the prophase of mitosis and plays a critical role in ensuring that each daughter cell receives an identical set of chromosomes. These fibers attach to the centromeres of the chromosomes and help to pull sister chromatids apart toward opposite ends of the cell during metaphase and anaphase. This separation is crucial for maintaining the proper chromosome number in the resulting daughter cells, ensuring that each cell has the genetic information necessary for its function. Without the accurate operation of spindle fibers, cell division can result in unequal distribution of chromosomes, leading to genetic abnormalities in the daughter cells.

The other functions listed do not pertain to spindle fibers; for example, DNA replication occurs earlier in the cell cycle and is performed by enzymes, not by spindle fibers. Engulfing organelles is a function typically associated with certain cellular processes but not specifically related to spindle fibers. Additionally, storing energy is a function of specific molecules like ATP and not related to the mechanical action of spindle fibers during cell division.