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Prep4USMLE Forum » USMLE Step 1 Forum » Biochemistry Forum

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phuluong2k
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02/11/05 - 12:45 PM

Total metabolism of saturated fatty acid C20 produce how many ATP ?

A. 163
B. 146
C. 130
D. 160

anatomy
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02/11/05 - 12:52 PM

"a"

phuluong2k
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02/13/05 - 01:16 AM

Yeah, you are right

mjl1717
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02/13/05 - 02:16 AM

Any explaination??

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phuluong2k
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02/13/05 - 04:12 AM

C16 Palmitic acid produces 8 acetyl CoA, 7 [NADH + FADH2]

:arrow: ATP = 8x12 + 7x5 - 2 (activation) = 129 ATP

C18

:arrow: ATP = 9x12 + 8x5 -2 = 146

C20

:arrow: ATP = 10x2 + 9x5 - 2 = 163

My conclusion every 17 ATP [ from 1 acetyl CoA & 1 NADH & 1 FADH2 ] for each 2 ATP addition :arrow: so 163 = 129 + 34 8)

plz correct if i am wrong

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