The _____ system is the system of glands that produce hormones for the bloodstream, such as the pituitary or thyroid glands. A: exocrine B: endotoxin C: exotoxin D: endocrine

The<br/>following substance could function as a Hapten:() A: ABO<br/>blood substance B: Small molecular chemical drug C: LPS D: Capsular polysaccharide E: Exotoxin.

Which<br/>of the following bacterium does not depend on endotoxin or exotoxin<br/>as pathogenic material?:() A: Ehrlichia<br/>coli B: Bacillus<br/>anthracis C: Mycobacterium<br/>tuberculosis D: Clostridium<br/>tetani E: Vibrio<br/>cholerae