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Kaplan Qbank USMLE



Author6 Posts
  #1

During a game a football player metabolized to carbon dioxide and water saturated fatty acids with 14-carbons. What is the appropriate number of ATP moles produced by 1 mole of this fatty acid ?
A.
B.
C.
D.
100
112
96
118

  #2

B 112

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deep breathing...

  #3

Sorry, here is my explanation:
Beta-oxidation produces after each cycle:
_1 FADH2 and 1 NADH= 2+3 ATP after the ETC
_1 acetylCoA= 11 ATP after TCA cycle and ETC

16 ATP per cycle x number of cycles required:
16x7= 112.

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deep breathing...

  #4

you mean one cycle involve 2 C so 7 cycles r required here ????

  #5

Sorry, actually it is 6 cycles but the number of acetyl-CoA is 7.
And the reaction uses 2 ATP to activate C14

So C14:0
7 acetylCoA x 12 ATP(3NADH+ 1 FADH+ 1GTP) in TCA +ETC = 84 ATP
6( NADH+FADH)=6x5 in ETC = 30 ATP
-2 ATP for activation
Total= 84+30-2= 112
I hope I got it right this time

___________________
deep breathing...

  #6

thnx.







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