Duchenne and Becker muscular dystrophy are dystrophinopathies. Dystrophin helps stabilize the muscle-cell membrane during contraction. When dystrophin is absent or markedly abnormal, repeated contraction injures the sarcolemma, calcium enters the muscle fiber, inflammation and necrosis follow, and muscle is gradually replaced by fat and fibrosis. Duchenne is typically more severe and earlier because functional dystrophin is absent or nearly absent. Becker is usually milder because some partially functional dystrophin remains. For NP certification preparation (United States), items rarely announce the topic in the first sentence. Anchor to objective data, trajectory, and the safest next step for the role named in the stem before distractors compete. On the exam, writers often pair stable-sounding options with unstable data—notice the mismatch before you commit. If the stem names a license or role, reread that line; scope errors are classic trap answers even when the clinical topic is familiar. Run a 60-second scan: breathing work and oxygenation, perfusion and end organs, neuro baseline, likely infection sources, and devices that can fail quietly. When two answers feel partly right, pick the one that reduces imminent...