Biology question

[Alaa1984]

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Hi,
For the Krebs cycle,
In feralis notes it says that the products for one round are: 3 NADH, 1 FADH2, 1 ATP, and 2 Co2.
For two rounds:
6 NADH, 2 FADH2,2ATP, and it says again 2 CO2??
Can you please clarify how many CO2 is produced?
Thanks

 

[DAT Destroyer]

Hi Alaa1984

Recall that glucose is split into two 3 carbon molecules that become pyruvate. Pyruvate loses carbon dioxide.....this is oxidative decarboxylation......and we form 2 molecules of Acetyl Co A.. Thus......each molecule does the TCA cycle........but since we have two molecules.,,,,,,,there are 2 turns.....hence we double the amounts of NADH, FADH2, ATP etc.

Yes there is a small typo as stated by Feralis,(It's 2 CO2 molecules for one cycle, 4 CO2 molecules for two cycles)........but the important thing to know is it occurs in the MATRIX.....there are two turns for the above stated reason......and everything is doubled

Hope this helps...

take care..Nancy

 

[FeralisExtremum]

That's a typo, I guess I haven't released an updated version of the notes in a while. It's 2 CO2 molecules for one cycle, 4 CO2 molecules for two cycles:

 

[DAT Destroyer]

That's a typo, I guess I haven't released an updated version of the notes in a while. It's 2 CO2 molecules for one cycle, 4 CO2 molecules for two cycles:

Yes there is a small typo as stated by Feralis,(It's 2 CO2 molecules for one cycle, 4 CO2 molecules for two cycles)........but the important thing to know is it occurs in the MATRIX.....there are two turns for the above stated reason......and everything is doubled