Question

the plasma membrane of some white blood cells contain ________ that bind with proteins of cells such as bacteria that have invaded the human body. these special proteins tell the white blood cells those bacterial cells do not belong to that particular human and to phagocytize (eat) them. channel proteins receptor proteins carrier proteins diffusion proteins

Explanation:

Receptor proteins on white - blood - cell plasma membranes bind to foreign proteins (like those on bacteria) to trigger phagocytosis. Channel proteins are for ion and molecule passage, carrier proteins transport substances across membranes, and there's no such thing as diffusion proteins in this context.

Answer:

B. receptor proteins