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Homework Help: Biochem practice exam help - Test tomorrow

  1. Apr 1, 2008 #1
    Hi all. I have a biochem test tomorrow, and would like some help. I went through the practice exam that was given to us, and from past experience the real test and practice test tend to be very similar. Also, from past experience, I tend to get a couple of them wrong because I believe that I have the right answer, but apparently not. So, I was wondering if someone could look over my work for me?

    I scanned in the exam, so to save room, I'll just link to the pictures.

    Page 1: http://img.photobucket.com/albums/v186/ChibiJosh/Biochem/2008-04-01-1527-06.jpg
    10 matching questions, there are a couple that I just sort of guessed at.
    For #8, I just assumed that since glucose ultimately begins glycolysis that an excess amount of it would cause glycolysis to speed up (which would possibly positively regulate PFK)
    For #3, the last chemical that was left on the list (aside from ATP and friends) was Dinitrophenol, so I thought it was the only one that could irreversibly inhibit citrate synthase.

    Page 2: http://img.photobucket.com/albums/v186/ChibiJosh/Biochem/2008-04-01-1528-14.jpg
    7 multiple choice questions which, again, I'm not sure on 2.

    Page 3: http://img.photobucket.com/albums/v186/ChibiJosh/Biochem/2008-04-01-1528-47.jpg
    7 Fill in the blank. There's one question that asks for the 5 vitamins of the alpha-ketoglutarate dehydrogenase enzyme complex, and the only one that I could find for sure was Thiamine.

    Page 4: http://img.photobucket.com/albums/v186/ChibiJosh/Biochem/2008-04-01-1529-22.jpg
    5 true/fase

    Page 5: http://img.photobucket.com/albums/v186/ChibiJosh/Biochem/2008-04-01-1530-25.jpg
    2 math problems. One dealing with calculating required kcal/day. I'm pretty sure I did this right. One is asking to calculate the deltaG' for ATP hydrolysis with concentrations. Here I'm not sure what I should use for T and what all the different reactions are.

    Page 6: http://img.photobucket.com/albums/v186/ChibiJosh/Biochem/2008-04-01-1531-07.jpg
    Calculating deltaG'º, I'm positive I got this right since it closely matches the value in the book.

    Page 7: http://img.photobucket.com/albums/v186/ChibiJosh/Biochem/2008-04-01-1531-43.jpg
    Diagram for going from 2-phosphogylcerate to pyruvate in glycolysis and any differences for gluconeogenesis. Again, I'm positive this is correct since i just checked it with the figures in the book.

    Page 8: http://img.photobucket.com/albums/v186/ChibiJosh/Biochem/2008-04-01-1532-14.jpg
    Krebb's cycle fun. I got the conversion correct, but I want to double check that I kept the right carbon "radiolabled"

    Thank you! I know this is a lot to ask.
  2. jcsd
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