Correct Answer: A
Explanation:
The cytoskeleton is a dynamic 3-dimensional structure that fills the cytoplasm, and is present in both eukaryotic and prokaryotic cells. The cytoskeleton acts as both muscle and skeleton, and plays a role in cell protection, cell motility (migration), cytokinesis, intracellular transport, cell division and the organization of the organelles within the cell.
Myosins are a large family of motor proteins that share the common features of ATP hydrolysis (ATPase enzyme activity), actin binding and potential for kinetic energy transduction. Originally isolated from muscle cells, almost all eukaryotic cells are known to contain myosins.