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    Spud93's Avatar
    Spud93 Posts: 12, Reputation: 1
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    #1

    Feb 12, 2011, 10:50 AM
    Interactions which hold the polypeptide chain together urgent help pleas
    This is an enzyme protein showing two of the interactions which hold the polypeptide chain together to give its characteristic higher-order structure.Give the full correct name of the interaction.
    Enzyme in atachments
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    cakeg's Avatar
    cakeg Posts: 1, Reputation: 1
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    #2

    Feb 13, 2011, 04:57 AM
    Hydrophobic interaction & hydrogen bond for the last interaction. All weak interactions
    phill_o's Avatar
    phill_o Posts: 1, Reputation: 1
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    #3

    Feb 13, 2011, 06:53 AM
    Actually I think the top one is ionic interaction and the bottom, hydrophobic interaction
    Unknown008's Avatar
    Unknown008 Posts: 8,076, Reputation: 723
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    #4

    Feb 13, 2011, 09:30 AM

    Nope, those two answers are wrong...

    Where you see a hydrogen atom covalently bonded to either N, O or F, you have to look out for any possible hydrogen bonding. The hydrogen atom acquires a partial positive charge and will form a hydrogen bond with an atom with a partial negative charge, including N, O or F.

    Now, when you see charges being clearly shown, that means there is an ionic bond somewhere.

    Well, if with those you can't get the answer, I don't know how to help you without giving those very obvious hints. :)
    DrBob1's Avatar
    DrBob1 Posts: 425, Reputation: 86
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    #5

    Feb 13, 2011, 09:42 AM
    The top interaction: -O-H...NH2R is a HYDROGEN BOND (a classic one)
    The lower interaction: -COO- ... +H3N- is an IONIC ATTRACTION (isn't it obvious?)
    Hydrophobic interactions are hydrocarbon groupa (aliphatic or aromatic) with each other.
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