What molecule can block the active sites of actin?

Name: What molecule can block the active sites of actin?
Brand: Quizplus
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Question

Quizplus · Accepted Answer

Tropomyosin is a molecule that can block the active sites on actin by covering the myosin-binding sites. In the presence of calcium ion, tropomyosin undergoes a conformational change, which allows it to move and expose the myosin-binding sites on actin. This exposes the binding sites, allowing for the interaction between actin and myosin, leading to muscle contraction.

What Molecule Can Block the Active Sites of Actin