Final answer:
The statement that only polyclonal antiserum can form precipitin is false, as both polyclonal antiserum and monoclonal antibodies can form precipitins, with polyclonal antiserum more likely to form visible precipitin due to binding multiple epitopes.
Step-by-step explanation:
The statement that only polyclonal antiserum has the ability to form precipitin is false. Both polyclonal antiserum and monoclonal antibodies have the ability to form precipitins, but polyclonal antiserum typically produces a more effective precipitin reaction due to its ability to bind to multiple epitopes on an antigen.
Polyclonal antiserum contains a variety of antibodies, which can recognize and bind to the various epitopes present on a single antigen. This creates the potential for lattice formation that leads to the formation of a visible precipitin. Monoclonal antibodies, on the other hand, are specific for a single epitope, which makes lattice formation and, consequently, visible precipitin formation, less likely but not impossible.