Multiple Choice Question

An antigen that is present in some but not all members of the same species is called a(n):

A. superantigen
B. interleukin
C. hapten
D. alloantigen
E. immunogen



Answer :

Final answer:

Antigens and epitopes play crucial roles in immune responses.


Explanation:

An antigen is a molecule that reacts with some component of the immune response (antibody, B cell receptor, T cell receptor). An epitope is the region on the antigen through which binding with the immune component actually occurs.


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Answer: D. Alloantigen

Explanation:

The antigen that is present in some but not all members of the same species is called an Alloantigen. When introduced to a member of the same species, the immune system recognizes it as foreign and fights it off.