Which of the Following Statements About C3 Is NOT Correct

Multiple Choice

Which of the following statements about C3 is NOT correct?

A) C3 contains an internal thioester bond that participates in covalent linkage to cell surfaces.
B) C3 is the most abundant complement protein in the serum.
C) A proteolytic fragment of C3 is part of both the C3 and C5 convertases.
D) Activated C3 is a serine protease that cleaves C4.
E) C3 in the plasma is spontaneously cleaved into C3b.