Final answer:
The Ig-Alpha/Ig-Beta receptor is involved in signal transduction, which is the process of transmitting a signal from a ligand-bound cell-surface receptor through the membrane into the cell's interior.
Step-by-step explanation:
The purpose of Ig-Alpha/Ig-Beta receptor is for signal transduction. This process occurs when a ligand binds to a receptor on the surface of a cell, causing a change in the receptor's conformation and transmitting the signal through the cell membrane into the cytoplasm. Internal receptors, in contrast to cell-surface receptors like Ig-Alpha/Ig-Beta, can interact directly with DNA to initiate transcription and translation for protein synthesis. Therefore, the correct answer to the question is a) Signal transduction.