Final answer:
Intermediate filaments are strong and ropelike structures that maintain cell shape and anchor organelles. They are composed of several strands of fibrous proteins wound together and can resist tension. An example of an intermediate filament protein is keratin, which is found in hair, nails, and skin.
Step-by-step explanation:
Intermediate filaments are strong and ropelike structures composed of several strands of fibrous proteins wound together. They have a diameter between that of microfilaments and microtubules and serve a purely structural function in maintaining cell shape and anchoring organelles. Unlike microtubules, intermediate filaments resist tension and help cells withstand pulling forces. An example of an intermediate filament protein is keratin, which strengthens hair, nails, and skin.