Innate immunity
A) is activated immediately upon infection.
B) depends on a newly infected animal's previous exposure to the same pathogen.
C) is based on recognition of antigens that are specific to different pathogens.
D) is found only in vertebrate animals.
E) utilizes highly specific antigen receptors on B cells.

Question

Quizplus · Accepted Answer

Innate immunity is the first line of defense and is activated immediately upon infection. It is a non-specific defense mechanism that is present in all animals, including humans and other vertebrates, as well as invertebrates. It does not depend on previous exposure to the same pathogen and is not based on recognition of specific antigens. Antigen-specific responses are provided by the adaptive immune system which utilizes highly specific antigen receptors on B cells.

Innate Immunity