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NBME 23 Answers

nbme23/Block 2/Question#11

An antiserum is elicited by immunization with ...

Proteins X and Y have no epitopes in common

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submitted by mousie(127),

An epitope, also known as antigenic determinant, is the part of an antigen that is recognized by the immune system, specifically by antibodies, B cells, or T cells. For example, the epitope is the specific piece of the antigen to which an antibody binds. - Wiki - Because the amount of Labeled X bound is unchanged by the addition of Y- they are independent of each other i.e. share no epitopes

For completeness sake, could someone explain the other wrong answer choices in graph form? I can easily visualize the right answer but for some reason can't picture the other choices

yb_26  check UWorld #12299 +2