Final answer:
Igα and Igβ are part of the B cell receptor complex and facilitate signal transduction for B cell activation and differentiation upon antigen encounter. Other statements regarding intracellular cytosolic protein binding, hydrophobic forces, and antigen binding do not accurately describe the role of Igα and Igβ.
Step-by-step explanation:
The correct statement regarding Igα and Igβ is that they facilitate signal transduction to ensure B cells divide and differentiate upon antigen encounter. These molecules, along with the membrane form of immunoglobulin, constitute the B cell receptor (BCR) complex. When an immunoglobulin on the surface of a B cell binds to an antigen, Igα and Igβ help transduce the signal from the membrane-bound immunoglobulin into the cell, leading to a series of cellular responses that include cell division, differentiation into plasma cells, and antibody production.
Other statements in the question either do not apply to Igα and Igβ or describe different cellular mechanisms. For example, internal receptors bind hydrophobic ligands and directly influence the making of a functional protein, while Igα and Igβ are part of a cell-surface receptor complex that transduces extracellular signals. They are not known to be linked by hydrophobic forces, and they do not bind to intracellular cytosolic proteins or antigens themselves.