Question

All of the following are true of some or all complement

proteins except _____.
a. they are soluble and bind to pathogen surfaces
b. they participate only in innate immunity
c. they are present in extracellular fluids, blood, and
lymph
d. they facilitate the phagocytosis of pathogens
e. they are made as zymogens.

Answer 1

Complement proteins are soluble proteins that bind to the surfaces of microorganisms to facilitate the phagocytosis and destruction of pathogens. Option B is correct.

Step-by-step explanation:

Complement proteins are a group of soluble proteins that are part of the immune system. They are not specific to any pathogen, so they do not bind only to certain types of pathogens. Instead, they bind to the surfaces of microorganisms in a specific sequence, coating the pathogen in complement proteins.

The complement system is part of innate immunity but it also plays a role in adaptive immunity. It facilitates the phagocytosis of pathogens by acting as a marker that indicates the presence of a pathogen to phagocytic cells.

Additionally, complement proteins can combine to form attack complexes that open pores in the cell membrane of the pathogen, causing it to leak and leading to its destruction.

Complement proteins are made as zymogens, which means they are produced in an inactive form that is activated through a series of enzymatic reactions.

They are part of both innate and adaptive immunity. Complement proteins are made as zymogens and are activated through a series of enzymatic reactions.