How many Atp is produced during the kreb cycle?

Question

is 2 right?

Answer 1

Always a somewhat difficult question. In a sense, the answer is zero. From the Krebs cycle there are three molecules produced that go on to make ATP: NADH, FADH2 and GTP. At the conversion of succinyl CoA to succinate, GTP is produced and the phosphates from the GTP are transferred to adenosine to make ATP. So, to make things simple, it is usually just said that 2 ATP are made *during* the actual Krebs cycle and this is appropriate in most contexts. The other molecules (NADH and FADH2) formed during the Krebs cycle go on to the electron transport chain which is where more ATP are made. The total theoretical amount of ATP made from glycolysis, the Krebs cycle and the electron transport chain is 38 ATP. Take away 2 ATP used for transporting 2 NADH into the mitochondrion (these are the 2 NADH made from conversion of pyruvate to Acetyl CoA, which occurs outside of the mitochondrion) and you have a total yield for the whole process of 36 ATP. It is unlikely that the total yield in vivo is greater than 30, but it actually isn't known for sure, it depends on the conditions in the cell.

Further, if you want to know how many ATP are (theoretically) produced *only* *from* the Krebs cycle proper (without the electron transport chain step), the answer is either 30 or 24 if you include the precursor step (2 NADH from pyruvate oxidation to make Acetyl CoA) or not, respectively. This is referred to as "from" because the Krebs cycle produces NADH and FADH2 that are used by the electron transport chain to produce ATP. The number of 30 or 24 includes the 2 ATP made during the Krebs cycle from GTP.

Confused yet??

Here are some websites that may help:

http://www.mrs.umn.edu/~goochv/CellBio/lectures/kreb/kreb.html

http://users.rcn.com/jkimball.ma.ultranet/BiologyPages/C/CellularRespiration.html

Answer 2

Krebs Cycle is 1 part of cellular respiration. In the Krebs Cycle, it uses 2 pyruvate molecules that are generated in Glycolysis beforehand. Before Kreb's Cycle can use it, it has to change it to Acetyl CoA.
When the Kreb's Cycle uses the two molecules of Acetyl CoA, it turns it into 6 NADH, and 2 FADH. (These can later be used in Electron Transport chain to generate much more ATP) But the Kreb's cycle also produces 2 ATP.

Answer 3

2 is produced through glycolosis. 36 during the kreb cycle for a total of 38.

Answer 4

Theoretically, it's 38 ATP that is produced, but in actuality it's less than 36 ATP (net) in the eukaryotic cells.

Answer 5

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

Answer 6

Answer is 2 ATP formed.

Answer 7

36

Answer 8

Nope. 1.