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    I'm revising AQA AS biology and I'm a little stuck with the immunological comparisons of proteins.

    I understand that when serum from species A is injected into species B it produces antibodies specific to species A's antigens. The part that I'm confused with is when the serum from species B is mixed with species C and the precipitate is formed. Is it correct to say the precipitate formation suggests a relationship between species A and C?
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    Hm, what exactly is the question you've been asked?

    These are completely different species, but they probably all share some sort of common antigen, albeit that antigen is in various forms in various species. It sounds like:

    The antigen in species A's serum is recognised by species B as foreign so an antibody response is mounted specific to the A antigen.

    When species B's antibodies are introduced with species C's serum, does the question insinuate that a precipitate is formed immediately? If so, then yes it would mean that species C and A share the exact same antigen to what the B antibody is specific to.
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    (Original post by antonyzac)
    Hm, what exactly is the question you've been asked?

    These are completely different species, but they probably all share some sort of common antigen, albeit that antigen is in various forms in various species. It sounds like:

    The antigen in species A's serum is recognised by species B as foreign so an antibody response is mounted specific to the A antigen.

    When species B's antibodies are introduced with species C's serum, does the question insinuate that a precipitate is formed immediately? If so, then yes it would mean that species C and A share the exact same antigen to what the B antibody is specific to.
    It wasn't a question, it was actually a topic I was revising straight from the book so it was really specific to AQA - I'll make sure I post a picture next time to make it easier. You were right in assuming the precipitation was formed straight away. I understand it now after reading your explanation, it was which species the link was between that was confusing with A, B and C.

    Thanks for your reply as I imagine I made it difficult to understand without context - apologies for that!
 
 
 
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