In mitosis, what is the primary role of spindle fibers (the mitotic spindle)?

• A. They build the cell wall by depositing cellulose at the division plane during cytokinesis.
• B. They form the nuclear envelope around each set of chromosomes at the start of mitosis.
• C. They attach to chromosomes at kinetochores and move sister chromatids to opposite poles of the cell.
• D. They replicate the cell’s DNA during S phase to ensure each daughter cell receives a complete genome.

Answer: (C)