the-complement-system-composed-of-approximately-30-proteins-primarily-produced-b

Question

The complement system functions as a defense mechanism against microbial infections, specifically bacteria, by initiating a cascade of reactions resulting in the destruction of foreign invaders. Which of the following statements best describes the mechanism of destruction of bacteria by the complement system:

Accepted Answer

Both (b) and (d).

Answer

Formation of antibodies that bind to the bacteria and enhance their phagocytosis.

Answer

Opsonization of bacteria by C3b, which can covalently bind to the surface of bacteria and enhance their phagocytosis.

Answer

Release of cytotoxic substances to kill the bacteria directly in a way similar to cytotoxic T-cell mediated destruction of pathogens.

Answer

Membrane attack complex formation, which consists of complement proteins C5b, C6, C7, C8, and multiple copies of C9, causing the formation of a pore-like structure in the bacterial membrane, disrupting the bacterial cell wall and membrane.

Answer

All of the above.