As Part of an Experiment, Radiolabeled ATP Is Injected into Skeletal

question 111

Multiple Choice

As part of an experiment, radiolabeled ATP is injected into skeletal muscle.  During muscle contraction, the labeled ATP is observed to attach to the sarcomere.  This attachment causes immediate:

• A)Calcium binding to troponin C
• B)Tropomyosin displacement from the groove on the actin molecule
• C)Myosin head detachment from the actin filament
• D)Cross-bridge formation
• E)Myosin light chain phosphorylation by a specific enzyme

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