Multiple choice

Which of the following initial complement components is bound by complement-fixing antibodies?

  1. C1s

  2. C3b

  3. C5a

  4. C9

  5. C1q
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

The constant region of IgM and of IgGI, IgG2 and IgG3 antibodies binds C1q after the antibody has complexed with antigen. 

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