Question on number of atp's from aerobic respiration

[MDMDJDJD]

FA 2009 (p101) says aerobic metabolism yields 30-32 ATP per glucose (depending on if youre using glycerol 3P shuttle or malate-asp shuttle).

RR Biochem (p 93) says aerobic metabolism yields 36-38 ATP per glucose (depending on if youre using glycerol 3P shuttle or malate-asp shuttle). They provide a breakdown:
Glycolysis: 2 ATP + 2 NADH --> 6-8 ATP
PDH: 2 NADH --> 6 ATP
TCA: 24 ATP

Why the discrepancy? All I could find on the boards was a q in the MCAT discussion where someone said the difference lies in whether you use 2 & 3 ATP per NADH or 1.5 & 2.5 ATP per NADH.... I did the math & that seems like a logical explanation for the difference.

I know it's minutiae, but does it matter which one we go with??

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[LostInStudy]

30 ATP in Eukaryotes and 32 ATP in Prokaryotes

-Glycolysis yields 2 ATP and 2 NADH which in total yields 5 or 7 ATP
-PDH yields 2 NADH which yields 5 ATP
-TCA yields 6 NADH, 2 GTP, 2 FADH2 for a total of 20 ATP

These are for the most recent understanding of ATP synthesis but some textbooks still cling to the previously established counts of 36 and 38 ATP

-LIS

 

[Vince86]

Prokaryotes with aerobic = 38 net ATP (Since they do not need to use 2 ATP in glycolysis.

Eukaryotes = 36 net ATP (Since they do use 2 ATP for glycolysis)

Prokaryotes with anaerobic = 2 ATP net

NADH from substrate level phosphorylation (Anything outside of ETC) = 2 ATP
NADH (Oxidative) = 3 ATP
FADH2 = 2 ATP
GTP = 1 ATP

 

[Compass]

Moved to Study Q&A.

My book actually says 36 to 38, depending on the process. I don't think the MCAT is nitpicky about either one by numbers.

 

[Isoprop]

In general biology, I learned 36/38. In cell bio, I learned that the recent research suggests 30/32.

I don't think the numbers matter.

 

[coat0023]

My TPR course this summer made sure to mention several times that the MCAT would be looking for 30 for eukaryotes and 32 for prokaryotes if the question were to arise.

I can't confirm this but I was told this by several people so take that for what you will.

 

[shaggybill]

My TPR course this summer made sure to mention several times that the MCAT would be looking for 30 for eukaryotes and 32 for prokaryotes if the question were to arise.

I can't confirm this but I was told this by several people so take that for what you will.

Interesting. EK Audio Osmosis says that unless specified otherwise, for the MCAT the number is 36.

 

[Isoprop]

According to my prof, the latest research shows 30/32. Someone mentioned that TPR's course, which should be updated, lists 30/32. EK may be outdated.

Doesn't matter though. Something like that is highly unlikely to show up on an exam.