Which of the following activities occurs at the site labeled $P$ in the given diagram of a myosin monomer?

  • A
    Actin binding
  • B
    $ATP$ synthesis
  • C
    $ATP$ hydrolysis
  • D
    Both $A$ and $C$

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$A -$ Calcium ions $(Ca^{2+})$ activate the interaction between myosin and actin filaments.
$R -$ The cross-bridge is formed in the presence of $ATP,$ and the breaking of the cross-bridge also requires the binding of a new $ATP$ molecule.

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