Which of the following is a function of the non-kinetochore microtubules?

• A. Maintaining an appropriate spacing among the moving chromosomes.
• B. Starting the separation of the cytoplasm once the final stage of mitosis is complete.
• C. Providing the ATP needed by the kinetochore microtubules to move the chromosomes.
• D. Pulling the poles of the cell closer together.
• E. Pushing the poles of the cell further apart.

Answer: (E)

Verified step by step guidance

1. Understand the role of microtubules in cell division: Microtubules are part of the cytoskeleton and play a crucial role during mitosis, particularly in the formation of the mitotic spindle.
2. Differentiate between kinetochore and non-kinetochore microtubules: Kinetochore microtubules attach to the chromosomes at the kinetochores and are responsible for moving chromosomes during mitosis. Non-kinetochore microtubules, also known as polar microtubules, do not attach to chromosomes.
3. Identify the function of non-kinetochore microtubules: These microtubules overlap at the cell's equator and are responsible for pushing the poles of the cell further apart during anaphase, contributing to cell elongation.
4. Eliminate incorrect options: Non-kinetochore microtubules do not maintain spacing among chromosomes, start cytoplasmic separation, provide ATP, or pull poles closer together.
5. Conclude with the correct function: The primary function of non-kinetochore microtubules is to push the poles of the cell further apart, aiding in the separation of the cell during mitosis.