Which cytoplasmic structure primarily supports the axon in eukaryotic cells?

• A. Mitochondria
• B. Lysosomes
• C. Microtubules
• D. Ribosomes

Answer: (C)

Verified step by step guidance

1. Understand the role of the axon in eukaryotic cells: The axon is a long, slender projection of a nerve cell (neuron) that conducts electrical impulses away from the cell body. It requires structural support to maintain its shape and function.
2. Review the cytoplasmic structures listed in the problem: Mitochondria, lysosomes, microtubules, and ribosomes. Each has distinct functions within the cell.
3. Focus on microtubules: Microtubules are part of the cytoskeleton, a network of protein filaments that provides structural support to the cell. They are particularly important in maintaining the shape and stability of the axon.
4. Explain why microtubules are the correct answer: Microtubules form tracks along which motor proteins transport organelles, vesicles, and other materials within the axon. This structural support is essential for the axon's function and integrity.
5. Clarify why the other options are incorrect: Mitochondria generate energy but do not provide structural support. Lysosomes are involved in waste processing and recycling. Ribosomes synthesize proteins but are not involved in maintaining axonal structure.