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The correct answer indicates that all of the listed options function as ATPases, which is accurate because each of these protein types utilizes ATP hydrolysis to drive their respective cellular activities.

Actin, when associated with myosin in muscle contraction, interacts with ATP to facilitate movement and force generation. While actin itself is primarily known as a structural protein, its interaction with myosin involves ATPase-like activity.

Dynein and kinesin, on the other hand, are motor proteins that transport cellular cargo along microtubules. Both proteins directly rely on the hydrolysis of ATP to change conformation and produce movement. Dyneins generally move toward the minus-end of microtubules, while kinesins typically move toward the plus-end. This ATP-dependent movement is crucial for various cellular processes, including intracellular transport and cellular division.

Hence, the overarching reason that all three components are identified as ATPases in this context is their reliance on ATP hydrolysis to perform mechanical work within the cell.