s?

Select the correct word from the list to complete each sentence. Not all terms will be used. 1. B-lymphocytes produce (Click to select) | against specific antigens. 2. When B-lymphocytes are exposed to an appropriate antigen, they proliferate into plasma cells and (Click to select) v (Click to select) 3. Each antibody consists of (Click to select) | polypeptide chains. antibodies constant 4. Antigens bind to the (Click to select) | regions of the polypeptide chains. four memory cells neutrophils two variable