Final answer:
True, myosins use ATP hydrolysis to move along actin filaments, which is a crucial process in muscle contraction and other cellular movements.
Step-by-step explanation:
The statement that myosins are motor proteins that use the energy of ATP hydrolysis to move along actin filaments is true. Myosins bind to the actin filaments and, by hydrolyzing ATP, undergo conformational changes that enable them to 'walk' along the microfilaments. This process powers many cellular movements, including muscle contraction, where myosin and actin filament interaction pulls the Z-lines closer, shortening the sarcomere as per the sliding filament theory. Actin itself is a protein that forms filamentous structures that serve as tracks for these motor proteins after being powered by ATP to assemble.