This protein is activated by the Ca²⁺-calmodulin complex to phosphorylate the myosin light chain protein.
A) tropomyosin
B) myosin heavy chain
C) myosin light chain kinase
D) myosin light chain phosphatase

Question

Quizplus · Accepted Answer

The Ca²⁺-calmodulin complex activates the enzyme myosin light chain kinase, which then phosphorylates the myosin light chain protein. Tropomyosin is a regulatory protein that blocks the myosin-binding sites on actin in the absence of Ca²⁺ ions. Myosin heavy chain is a structural protein that forms the thick filaments in muscle fibers. Myosin light chain phosphatase is an enzyme that dephosphorylates the myosin light chain protein, leading to muscle relaxation.

This Protein Is Activated by the Ca²⁺-Calmodulin Complex to Phosphorylate