How many molecules of atp does fermentation yield

how many molecules of atp does fermentation yield
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Four total molecules of ATP are formed during glycolysis.

Two, however, are used during the glycolysis reactions. So the net gain is 2. Its the same thing for the total Atps made. A total of 2 ATP are produced. However ATP is also used in various processes like tranporting molecules, so your net yield of ATP is usually lower, more like 36 or something. Just talking about gain here. No ATPs are made during fermentation. There is actually a range of 30 to 38 total made because the amount made by oxidative phosphylaton varies.

how many molecules of atp does fermentation yield

So what you people are saying is that my answer, or whatever I put on the last post is wrong? I see that no ATP is formed during the fermentation yet what i was trying to say was combination of fermentation and glycolysis I know what fermentation is though. Fermentation - anaerobic process for making ATP's. I think it's opposite of respiration. If oxygen is not present, then ATP production will be restricted to anaerobic respiration.

Carbohydrate catabolism

The location where glycolysis, aerobic or anaerobic, occurs is in the cytosol of the cell. In glycolysis, a six-carbon glucose molecule is split into two three-carbon molecules called pyruvate. In order for the glucose molecule to be oxidized into pyruvate, an input of ATP molecules is required.

how many molecules of atp does fermentation yield

This is known as the investment phase, in which a total of two ATP molecules are consumed. Even though ATP is synthesized, the two ATP molecules produced are few compared to the second and third pathways, Krebs cycle and oxidative phosphorylation. Even if there is no oxygen present, glycolysis can continue to generate ATP. In alcohol fermentation, when a glucose molecule is oxidized, ethanol ethyl alcohol and carbon dioxide are byproducts. Each pyruvate will release a carbon dioxide molecule, turning into acetaldehyde.

In lactic acid fermentationeach pyruvate molecule is directly reduced by NADH. The only byproduct from this type of fermentation is lactate.

Lactic acid fermentation is used by human muscle cells as a means of generating ATP during strenuous exercise where oxygen consumption is higher than the supplied oxygen. As this process progresses, the surplus of lactate will be brought to the liver where it will be converted back to pyruvate. This pathway does not require oxygen; this is why it is also the first pathway in the anaerobic breakdown of glucose in addition to the aerobic breakdown of glucose and is the primary energy source for most organism, such as bacteria.

In this process, one molecule of glucose is converted into two many of pyruvate or pyruvic acidwhich generates energy atp the molecule of two ATP molecules two net molecules.

In eukaryotic organisms, oxidative phosphorylation takes place in the mitochondria how mitochondrial cristae within cells. So the total is 38 ATP molecules. This means that if you take 1 molecule of glucose and hydrolyse it you get 38 yields of ATP. This is a lot of ATP energy that is produced; 38 ATP molecules for every 1 molecule of glucose is very efficient — so it can be said that the aerobic breakdown of glucose is a doe energy yielding process. Thus the process of the aerobic breakdown of glucose breaks down a single glucose molecule to yield 38 units of the energy storing ATP molecules; it is able to convert glucose into ATP more efficiently, without creating any excess waste products or byproducts as is the case in the anaerobic breakdown of glucose.

The anaerobic breakdown of glucose occurs in our bodies mainly during quick intense spurts of exercise such as sprints or weightlifting. During these forms of exercise, the fermentation would not be able to provide enough oxygen for the normal aerobic processes to occur.

If you do the math, you end up with 2 less ATP. This approach has worked well for over 30 years. Why do I talk about pyruvate processing?

how many molecules of atp does fermentation yield

Because in Fermentation pyruvate is processed to either 2 lactate or 3 ethanol rather than 1 acetyl-CoA. So there are three types of Pyruvate Processing. Also pyruvate can be produced from other pathways such as fatty acid beta oxidation which can then be converted to acetyl-CoA and fed into the Krebs cycle. Pyruvate vs Pyruvic acid?

ATP consumption during glucose breakdown

Cristae are the ridges in the inner mitochondrial membrane, not THE inner mitochondrial membrane. Cristae increase the total surface area of the inner mitochondrial membrane which allows for more ETC systems per mitochondrion. The ETC basically creates a battery where there are more protons on the outside than inside of inner membrane.

how many molecules of atp does fermentation yield

So protons diffuse back to matrix due to proton concentration gradient and relatively negative matrix.

So this is an electrochemical gradient driving ATP synthesis. The actual number of ATPs you yield from one molecule glucose is Why the discrepancy of 36 vs 38 ATP?

If you add up all the ATP by substrate level phosphorylation you have 4. Adds up to 38 ATP.

how many molecules of atp does fermentation yield

See, NADH molecules produced during glycolysis cannot enter mitochondria directly. They hand over their energy to other molecules. This entry of glycolytic energy inside mitochondria is performed by shuttles in eukaryotes absent in prokaryotes. There are 2 types of shuttles: Found in skeletal muscle and brain cells.

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