<prompt> C3 convertase acts on -C4b2bC4b2B3bC4bC3  <response>: Ans- D C3 Reference- Jawetz Melnick Adelbergs Medical Microbiology - 27E 2016 Page 142. The latter protein C4b2b is an active C3 convertase, whichsplits C3 molecules into two fragments: C3a and C3b. C14b2a is known as C3 convertase which activates C3 to C3a chemotactic and anaphylotoxin and C3b 