Why does calcium not bind to calmodulin in an nonstimulated cell?
A)Calmodulin's affinity for calcium ions is too low to allow binding in an nonstimulated cell.
B)Calmodulin's affinity for calcium ions is too high to allow binding in an nonstimulated cell.
C)In an nonstimulated cell,calcium ions are destroyed.
D)In an nonstimulated cell,calcium ions are produced.
E)In an nonstimulated cell,calcium ions preferentially bind to another protein in the cytosol.

Question

Quizplus · Accepted Answer

Calmodulin's affinity for calcium ions is regulated by the concentration of calcium ions. In a nonstimulated cell, the concentration of calcium ions is relatively low, so the affinity of calmodulin for calcium ions is also low, making it unlikely for calcium to bind to calmodulin.

Why Does Calcium Not Bind to Calmodulin in an Nonstimulated