Question

microtubules:
a provide structure and support to the cytoplasm
b are solid, supporting rods of protein
c contain the protein myosin
d are the smallest components of the cytoskeleton
e are a component of mitochondria

Explanation:

• Microtubules are part of the cytoskeleton. Their main function is to provide structural support to the cytoplasm.
• Option B: Microtubules are hollow, not solid. Intermediate filaments are solid.
• Option C: Myosin is associated with muscle contraction (actin - myosin interaction in muscle fibers), not microtubules.
• Option D: Microfilaments (actin filaments) are the smallest components of the cytoskeleton, not microtubules.
• Option E: Microtubules are not a component of mitochondria.

Answer:

A. provide structure and support to the cytoplasm