Which statement about the cytoskeleton is true?

• A. Intermediate filaments are hollow tubes of protein that provide structural support.
• B. Microtubules are chains of proteins that resist stretching.
• C. Microfilaments are more permanent structures in cells compared to intermediate filaments and microtubules.
• D. Plant cells lack a cytoskeleton because they have a rigid cell wall.
• E. Components of the cytoskeleton often mediate the movement of organelles within the cytoplasm.

Answer: (E)

Verified step by step guidance

1. Understand the components of the cytoskeleton: The cytoskeleton is composed of three main types of protein filaments: microfilaments, intermediate filaments, and microtubules, each with distinct structures and functions.
2. Microfilaments are thin, thread-like structures made of actin proteins, primarily involved in cell movement and shape changes.
3. Intermediate filaments provide mechanical support for the cell, helping it maintain its shape and integrity. They are more stable and permanent compared to microfilaments and microtubules.
4. Microtubules are hollow tubes made of tubulin proteins, playing a crucial role in maintaining cell shape, enabling intracellular transport, and facilitating cell division.
5. Recognize the role of the cytoskeleton in organelle movement: The cytoskeleton, particularly microtubules and microfilaments, is essential for the movement of organelles within the cytoplasm, often through motor proteins that travel along these filaments.