Which of These Statements Does NOT Describe Cross Bridges

question 107

Multiple Choice

Which of these statements does NOT describe cross bridges

• A)They are the globular heads of myosin molecules.
• B)They have actin binding sites that are normally covered by troponin and tropomyosin, except during excitation-contraction coupling.
• C)They bind with actin and then bend to pull the thin filaments inward during contraction according to the sliding filament mechanism.
• D)They require Mg2+ to bind ATP to them.

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