14. Which of the following statements is true regarding monoclonal antibodies when compared to polyclonal antibodies? (A) They are labeled with chemicals that can be visualized (B) They are produced by cells from the same organism that produced the antigen (C) They are synthesized by a population of identical, or "cloned," cells (D) They are synthesized only in living organisms (E) They have only a single polypeptide chain that can recognize an antigen