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amino acids

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For the amino acid Lysine, the nitrogen with the H attached to it is not basic (since you can draw out the resonance for it). But the other nitrogen that has a double bond is not basic. Why is this?? I can draw out the resonance for the double bonded nitrogen as well.. so shouldnt it be considered nonbasic as well. can someone please explain this to me? Thanks

  • amino acids -

    I don't have an explanation for you. The site below shows the structure of lysine and I don't see any doubly bonded N atoms. Both amino groups appear to be primary to me.
    http://en.wikipedia.org/wiki/Lysine

  • amino acids -

    sorry i was referring to hisidine

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