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Immune System - Medical Science

Q1:

Which of the following is correct for isoantigens?

A They are antigens found in all members of different species

B They are antigens found in some members of a species

C They are antigens found in all members of a species

D They are antigens found in some members of different species

ANS:B - They are antigens found in some members of a species

An isoantigen is a type of antigen which presents only in subsets of a species. They are two types : blood groups antigen, histocompatability antigen.