Question

Which of the following is not a characteristic feature of acquired immunity? 1 Immunogenic memory 2 Non-specificity w.r.t antigen 3 Self-nonself recognition (discrimination) 4 Diversity

Answer 1

Answer:

Non-specificity w.r.t antigen is not a characteristic feature of acquired immunity.

Explanation:

Acquired immunity, also known as adaptive immunity, is mediated by B lymphocytes, T lymphocytes, or both, all of which have a distinct surface receptor for the same antigen.

Acquired immunity has the following characteristics:

• Immunologic memory:  Even after many years, once an antigen has been detected and responded to, the system is able to respond more powerfully to repeated exposure.
• Discrimination between self and non-self: It is able to tell the difference between self-cells (host cells) and alien cells and substances. Only foreign particles are targeted for attack. Auto-immune disorders occur from the failure of this differentiation.
• Diversity:  They are diverse in that they can react to a wide range of antigens.