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AAMC 7 Biology question

Discussion in 'MCAT Discussions' started by sky walkerz, Apr 8, 2004.

  1. sky walkerz

    sky walkerz Junior Member
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    Question 171...


    [passage crap blah...blah...blah]
    The IR absorption of hydroxyl and carbonyl groups respectively occurr at

    A 1700 and 2250
    B 1700 and 3400
    C 3400 and 2250
    D 3400 and 1700


    I was thinking D but the answer key says B. Anyone else have some input?

    Is it possible for the AAMC to be wrong?

    Thanks-
    Luke the Duke
     
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  3. krull

    krull Membership Revoked
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    b and d are just switched. It gives you the hydroxy first in the question, so it's 1700, 3400 :D Read downfield to upfield:D
     
  4. sky walkerz

    sky walkerz Junior Member
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    Yes but, isn't the carbonyl group about 1700 and the OH value about 3400?

    I rarely get these things wrong so I need to clarify before "D Day"
     
  5. krull

    krull Membership Revoked
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    99 percent it is wrong. never saw that on the real mcat anyway, so dont sweat it too much
     
  6. CanIMakeIt

    CanIMakeIt Fellow
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    Step 4 involves the addition of an acetyl group (CH3CO) to Compound 4 which is an acetylation reaction.

    I just checked it on web and the above explanation provided does not make any sense.

    I think the answer should be D
     
  7. krull

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    then there was something in the passage that i did not know :D
     
  8. CanIMakeIt

    CanIMakeIt Fellow
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    still ... i don't think the explanation provided will change the IR peaks ....... carbonyl peak is not going to shift from 1700 to 3400 just because of some intermediate reaction ........ carbonyl is carbonyl regardless of how it was formed ..... I am going to write to e-mcat about that

    Anyone else has any insight
     
  9. sky walkerz

    sky walkerz Junior Member
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    I wrote to AAMC this morning and was told to check back later for "ammendments" to the exam. Apparently there are other mistakes/unclear statements and explanations in the test.

    Now, may I please have my $40 back, as I am not in the habit of paying for someone else's mistakes.

    Those b*st*rds!!!
     
  10. CanIMakeIt

    CanIMakeIt Fellow
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    This is what is at the e-mcat website .....


    Practice Test 7 has been updated with the following changes:

    Physical Sciences - #26 - New solution
    Physical Sciences - #28 - New solution and answer
    Biological Science - #163 - Now associated with different passage
    Biological Science - #171 - New solution and answer

    If you previously took this test, your scores have been updated to reflect the changes. We apologize for the inconvenience. Please contact technical support if you have any questions or problems.
     
  11. gdk

    gdk Senior Member
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    printed out 7 yesterday and took it this morning. correct ans for 171 is now d
     
  12. jxu66

    jxu66 Member
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    Thankfully, they changed the 163 to different sections. I was wondering for awhile what's that question was coming from as an independent question. :confused:
     
  13. blz

    blz Senior Member
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    Yea lol, I thought it was kinda odd that I had to know the structure for Taxol. I thought AAMC was pushing it a little with that one.
     

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