Question

Select the correct statement about complement. A. Complement can be activated through three pathways: classical, secondary, and alternate. B. Complement proteins C1 through C9 act exclusively in the classical pathway. C. An adaptive immune mechanism is often involved in directing complement to its target. D. The membrane attack complex consists of complement proteins C3a through C5.

Answer 1

Answer:

C

Explanation:

A is wrong as 3 pathways are: classical, lectin, alternative

B is wrong - many C1-C9 act in other 2 ways EX C5

D is wrong - MAC consists of C5-C9

Answer 2

C. An adaptive immune mechanism is often involved in directing complement to its target.