How many ATP is produced during the kreb cycle?

Answer 1

Terri:

The answer given to you for a related question is incorrect:
http://answers.yahoo.com/question/index;_ylt=AiO3vXe8c3JkJmBR.7ZR8ZL9xQt.;_ylv=3?qid=20070929150300AAJaIzl

The number of ATP produced during glycolysis, the Krebs cycle and from the products of the Krebs cycle (which are taken to the electron transport chain) is 38, minus 2 used in glycolysis for a net ATP production of 36.

The number of ATP produced *during* the Krebs cycle is 2. The number of ATP produced *from* the Krebs cycle depends on where you want to start counting, it is either 30 or 24 if you include the precursor step (2 NADH from pyruvate oxidation to make Acetyl CoA) or not, respectively. I referred to this as "from" because the Krebs cycle produces molecules (NADH and FADH2) that are used by the electron transport chain to produce ATP in addition to the fact that the Krebs cycle produces 2 ATP directly.

Here is website that details the process:

http://www.uic.edu/classes/bios/bios100/lecturesf04am/lect12.htm

Answer 2

Um Actually they are different NADH's. In Respiration, It's NADH. In Photosynthesis, it's NADPH. See why they produce different amount of ATP? Because they are not the same NADH's