"Net force" simply means the sum of all forces. The "unless acted upon by a net force" version is more correct. For example, as you stand or sit still, the earth pushes you up with a force equal and opposite to the force with which gravity pulls you down. The net force, or total force, is zero, so you do not move.
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The bound together cell hypothesis expresses that: all living things are made out of at least one cell; the cell is the fundamental unit of life, and new cells emerge from existing cells.
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A complete round of ATP hydrolysis produces a single 'step' or movement of myosin along the actin filament. ... Step 2: ATP binding to the myosin head domain induces a small conformational shift in the actin-binding site that reduces its affinity for actin and causes the myosin head to release the actin filament.
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