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Saturated and unsat. acids

Discussion in 'MCAT Discussions' started by Toejam, Aug 18, 2002.

  1. Toejam

    Toejam Terminal Student

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    Sorry that I can't let it go, but....

    One of the questions that dealt with that list of fatty acids (linoleic, stearic, etc.) asked which could transform into another one using H2 and Pd (I think). I looked at that question for some time and for the life of me, couldn't even add up the carbons correctly.

    Anyone remember that one?
     
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  3. SuzyQ

    SuzyQ Senior Member

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    didnt it ask whichh one could NOT be made into the specific fatty acid using H2 and pd? Anyway...the fatty acid you were trying to make had 17 carbons i think....and one of the choice answers had 15 carbons or 16..cant rememer...so that one was the right answer.
     
  4. WonderBoy

    Physician

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    Yea that one was annoying. I think I put D, its was one of the linoleic (sp?) acids, there were two acids starting with L. Complete guess though, didn't know what the hell was going on.

    I had from AT also. Anyone else remember that one?
     
  5. Mimicat

    Mimicat Senior Member

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    I had form AT too. I think I put Lineolic acid (think it was D). It was the one that had the most double bonds I think, and it had fewer carbons. Can't really remember.... I think I blocked most of form AT out :mad: .
     
  6. basha

    basha Senior Member

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    yea, i had AT too....that one was definitely choice a, cuz it didnt have enough carbons to qualify.........also, did you think that AT was reallllyyyy tuff. How did u do on that genetics questions, OIC/OIC question...man, it was terrible.
     
  7. Biffer

    Biffer The good times doc

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    In one fof the above posts you guys mention a 15 C chain.. I only counted evens for all chains? in fact, that was what I put for the first question in the section.. anyone else?

    peace,
    biffer
     
  8. WonderBoy

    Physician

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    I counted all the Carbon chains also and yes they were all even. Didn't make sense.

    I am hoping the lac Operon passage was experimental, they may have been just using to prepare for the April '03 changes.
     
  9. nero

    nero Senior Member

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    yeup, you're right samoa........it was palmitic acid.....it had i think 2 less carbons then the rest of them.......definitely it was choice A.

    nero
     
  10. Mimicat

    Mimicat Senior Member

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    duh... what was I thinking with the double bond thing... I can't really remember what I put for that question now. Hopefully it wasn't the one with the double bonds.
     
  11. freakazoid

    freakazoid Guy Friend Extraordinaire

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    I agree with Nero. The idea of that question was to simply count the number of carbons in the fatty acids . . . the structures made it a little difficult. Three out of the four choices had 18 C, while only one of them had 16 C. So it was that one, which I think is A, at least that's what Nero said.
     
  12. conure

    conure Master Distiller

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    I'll go ahead and pile on here.

    You guys are right about the correct answer having a different number of carbons. Freak is correct on this one.

    Also fatty acids are always even numbered chains usually 16-18 carbons long.

    There was also a question in this passage about esterification with glycerol.

    Oh yeah I had form AG and this passage was on there.
     
  13. Spiderman [RNA Ladder 2003]

    Spiderman [RNA Ladder 2003] Platinum Member

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    Yes, it is what I noticed too. all the acids on the list were even, 16, 18 carbons.
     
  14. marleybfour

    marleybfour Senior Member

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    H2/Pd breaks a double bond and changes the compound into an alkane. The correct answer was the one with no double bonds because it asked which one would NOT be transformed.
     

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