Which of the Following Statements is NOT a Defining Characteristic

Question

Which of the following statements is NOT a defining characteristic of adaptive immunity?  
A) Self/nonself recognition
B) Tailored to specific antigens
C) Ability to produce diverse antigen receptors
D) Memory allows a fast and strong secondary response
E) Fast-acting initial response mediated by complement

Accepted Answer

The statement "Fast-acting initial response mediated by complement" is not a defining characteristic of adaptive immunity. Complement is a component of the innate immune system, which provides the first line of defense against pathogens. Adaptive immunity, on the other hand, is characterized by its specificity and ability to tailor a response to a particular pathogen.