Most of the ocean environment consists of very deep water beyond the shallow coastal region. This open ocean environment is sometimes referred to, simply, as

Protein A must have regions of shape and charge that are complementary to those on Protein B.

Explanation:

-Molecular shape determines how biological molecules recognize and respond to one another with specificity. Biological molecules often bind temporarily to each other by forming weak interactions, but only if their shapes are complementary, and if their functional groups and surface charges are compatible. The role of molecular shape illustrates how biological organization leads to a match between structure and function, one of biology's unifying themes.