VI. Diagram and label the pathways of complement activation. V. a. Diagram and discuss the process of primary and secondary production of antibodies. Primary and secondary antibodies share a common structure. Antibodies are Y . shaped molecules with 3 three portions of roughly equal size. They are composed of two identical light chains and two identical heavy chains - disulfide bonds join the two heavy chains together and each heavy chain to a light chain. b. How would this apply to Rh factor and pregnancy? c. How does this apply to vaccination? III. Draw and label diagrams of 2 classes of antibodies..