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Biochem. Question

Discussion in 'NBDE Exams & Licensure Exams' started by industrious1, May 1, 2007.

  1. industrious1

    industrious1 New Member 2+ Year Member

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    Jun 25, 2006
    Hello everybody
    I ran into this question:

    Which of the following pairs of amino acids is expected to be found in the interior of a globular protien?
    A.lysine and arginine
    B. arginie and leucine
    C. leucine and valine
    D. valine and glutamic acid
    E. glutamic acid and lysine

    Can anybody please explain why "C" is the correct answer? and thanks in advance :)
     
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  3. Tired Pigeon

    Tired Pigeon 7+ Year Member

    941
    3
    Jan 27, 2007
    Hydrophobic side chains will be sequestered away from water.
     
  4. industrious1

    industrious1 New Member 2+ Year Member

    41
    0
    Jun 25, 2006
    thank u very much :)
     
  5. drli

    drli 7+ Year Member

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    Jan 3, 2007
    which statement below concerning G-protien is true ?

    1 G-protiens bound to GDP are inactive

    2 activation of membrane receptor triggers an exchange of GDP for GTP on G-protiens

    3 adenylate cyclase activates G-protiens and causes dissosciation between alpha and beta gamma subunits

    4 cyclic AMP acivates G-protiens, leading to exchange of GDP for GTP
     
  6. bigtooth

    bigtooth 2+ Year Member

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    Feb 16, 2007
    Well this looks a bit confusing because both - option 1 and 2 seem to be true.
    A G-protein is bound to GDP in its inactive state and activation of the membrane receptor triggers an exchange of GDP for GTP making the G-protein active ( by activating the alpha subunit and causing its dissociation from the gamma and beta).

    correct me if i'm wrong...
     
  7. drli

    drli 7+ Year Member

    40
    0
    Jan 3, 2007
    I agree with u ...both 1 and 2 looks correct....
    this question was in the decks ...n they had given 1 as the right answer.....


    probably it was one of thier badly edited pages
     

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