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Another real Q's on MCAT!

Discussion in 'MCAT Discussions' started by jbag, Apr 26, 2002.

  1. jbag

    jbag Junior Member

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    If a protein has a head group is non polar and the tail group is polar, then is it
    a) hydrophilic
    b) hydrophilic
    c) amphoteric
    d) Polar
     
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  3. Sm00th13

    Sm00th13 Senior Member
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    </font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by jbag:
    <strong>If a protein has a head group is non polar and the tail group is polar, then is it
    a) hydrophilic
    b) hydrophilic
    c) amphoteric
    d) Polar</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">I think you might have read this question wrong because the thing that has a head group and a tail group are phosphorlipid from the bilayer membrane. I never heard of proteins having a head group and/or a tail group. Maybe a transverse transmembrane protein sticking from the cystoplasm side and extracellular side. Besides, There's not a lot of inform. given for this question. Then again, maybe it can be amphipathic.
     
  4. jbag

    jbag Junior Member

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    No, actually, that was the exact Q's; I too was perplexed why they reversed it.
     
  5. Sm00th13

    Sm00th13 Senior Member
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    Well it could be amphipathic or it could be a MCAT error (which does occur) on AAMC's part. I say it's an MCAT error. choice D should have at least been amphipathic (e.g. having hydrophobic and hydrophillic properties). :cool: :cool:
     
  6. Alli Cat

    Alli Cat Flygirl
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    I agree with choice d) polar. Amphoteric refers to a molecule that has acidic and basic properties; the Q didn't address this. I bet a lot of people picked it because it sounds like "amphipathic." I believe that proteins can have polarity in terms of hydrophobicity, which you talk about in terms of micelles and inclusion bodies... anyone else?
     
  7. Sm00th13

    Sm00th13 Senior Member
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    </font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by Alli Cat:
    <strong>I agree with choice d) polar. Amphoteric refers to a molecule that has acidic and basic properties; the Q didn't address this. I bet a lot of people picked it because it sounds like "amphipathic." I believe that proteins can have polarity in terms of hydrophobicity, which you talk about in terms of micelles and inclusion bodies... anyone else?</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">It's not the terms of polar or nonpolar that the problem. It's the uses of "head groups" and "tail groups", e.g. how is it define on a protein. It could be define based on the spatial location of the protein in bilayer membrane. Or it could be based on the the percentage of polar to nonpolar; or vice versa.
     
  8. CamelJockey

    CamelJockey Member
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    I had that question too. And now looking at it with more "time", I see thats another I missed...great... <img border="0" title="" alt="[Eek!]" src="eek.gif" />
     

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