55.  Identify a MISMATCHED pair from the following,  Group of answer choices lethal factor :::: protease activity; inhibits chemokine production. edema factor :::: unregulated cAMP synthesis protective antigen ::::  binds and assembles at target cell membrane protective antigen :::: acts as a biosensor ; detects higher temperature of the digestive system to become active protective factor :::: aids in bringing other toxins components inside cell via endocytosis

45. Host defenses In the process called concentration gradients of microbial substances and inflammatory mediators guide phagocytes to the area of microbial invasion. diapedesis chemotaxis margination inflammation

The formation of the C3 convertase is a key step in complement activation that occurs in all three complement pathways. This enzyme cleaves C3 in blood plasma, leading to a conformational change in the C3b fragment that exposes its reactive thioester group. The activated C3b is potentially harmful to the host, if it becomes covalently attached to a host cell, rather than to the surface of a pathogen. This deleterious outcome is largely avoided by:  The inability of active C3b to diffuse away in the blood plasma. The inability of active C3b to covalently attach to the membranes of eukaryotic cells. The rapid hydrolysis of active C3b in solution, rendering it inactive. The tight binding of active C3b to the C3 convertase. The ability of active C3b to recruit phagocytic cells.

Antibodies play a critical role in the prevention of infection by the specific viruses the antibody is designed to detect. Which immune system cell produces antibodies? Indicate four ways that antibodies can disrupt the ability of a virus to infect a cell.  PLEASE ANSWER ALL PARTS TO THIS QUESTION