Which of the following BEST describes why it is challenging for surface immunoglobulin to transduce a signal into the cell upon antigen binding?
A. It takes twice as much antigen to stimulate the cells because each antibody has two antigen binding sites.
B. The cytoplasmic domain of surface Ig only has three amino acids.
C. Iga is rapidly dephosphorylated.
D. Ig is an inflexible molecule.
E. All of the above.
Answer: B