Question

which of the following components of the cytoskeleton is made of two actin chains twisted around one another? a primary filaments b microfilaments c microtubules d intermediate filaments

Explanation:

Microfilaments are composed of two intertwined actin chains. Microtubules are made of tubulin proteins, intermediate filaments are made of various proteins depending on the cell - type, and there is no such thing as primary filaments in the context of the cytoskeleton components.

Answer:

B. Microfilaments