Final answer:
Myosins are motor proteins that use ATP hydrolysis to move along actin filaments, which is true. This action is central to muscle contraction and other cellular movements, as described by the sliding filament theory.
Step-by-step explanation:
The statement is TRUE: Myosins are indeed motor proteins that utilize the energy from ATP hydrolysis to move along actin filaments. This process is particularly evident in muscle cells, where the interaction between actin and myosin filaments leads to muscle contraction. ATP powers actin assembly into its filamentous form, creating tracks on which myosin can walk, a phenomenon critical to cellular events such as eukaryotic cell division and cytoplasmic streaming in plant cells. The sliding filament theory explains how muscle fibers contract through myosin filaments using ATP energy to "walk" along the actin filaments, which results in pulling Z lines closer together and thus shortening the sarcomere. The myosin head binds to actin and then pulls it towards the center of the muscle fiber in what is known as the power stroke during contraction, a process driven by the energy released from ATP hydrolysis.