Consider the Apical Location of a Particular Protein Expressed in Epithelial

Consider the apical location of a particular protein expressed in epithelial cells, illustrated in part A of Figure 11-36.When a molecule that chelates calcium is added to the cell culture medium, you observe a redistribution of that protein around the entire cell, shown in part B of Figure 11-36.Which is most likely to be true about the role of calcium in maintaining an apical distribution of protein A? Figure 11-36

A) Calcium is required to maintain the structural integrity of the junctional complex.
B) Calcium is required for the binding of the junctional proteins to the cell cortex.
C) Calcium is a structural component of protein A.
D) Calcium inhibits the intracellular transport of protein A.