In VCAA 2017 Exam question MC 24 why is the answer C instead of A. When self reactive B and T cells are present doesn’t that mean our self antigens are kind of like allergens? Because they are a usually innocuous substance which is eliciting an immune response?
EDIT: also for Q25 isn’t option D too much of a generalisation to get from the results? It’s such a broad statement
Is Q36 still relevant to the study design or does it (answer B) border on cultural evolution- which was taken out?
This was my exam (ahhh the memories, lets break this down)
MC Q24: it seems like your mixing up the mechanisms of allergies and autoimmune disease. Allergies respond to an
exogenous antigen, something that is outside the body, whereas in MS self-cells target and damages the myelin which is mediated by T helper cells. That's why C is correct. I encourage you to review this topic on autoimmune disease and be confident to distinguish between the diseases covered in the study design.
MC Q25: yes its a generalisation, but a logical one given the limited information you have, if MS females are less likely to get a H. pylori infection this suggets H. pylori exposure protect against MS, as females who get a H. pylori infection do not get MS. Again a generalisation, but this question is testing your ability to come to logical conclusions. A-C were either unlogical or factually incorrect from the information provided, I encourage you to use the process of elimination to answer these type questions, it is evident that A-C were not consistent with the results provided.
MC Q36: is likely not examinable as it tests cultural evolution
Hope this helps!