Under anaerobic conditions, how many ATP and NADH are produced in glycolysis starting with 2 molecule of glyceraldehyde-3-phosphate and ending with 2 molecules of lactate?

Respuesta :

Answer:

→net of 4 ATPs  are produced, with 2 ATPs actually available

→No NADH is  produced.

Explanation:

Glycolysis is an anaerobic reaction. Glyceraldehyde-3-phosphate, is an intermediate in the conversion of glucose to PYRUVATE. the end-product of Glycolysis.

In the conversion of  2 molecules  of Glyceraldehyde-3-phosphates  via intermediate  to pyruvate,  hydrogenation occurs. One hydrogen ions is removed from  each of the 2 molecules of Glyceraldehyde-3-phosphate  and  transferred to each molecule of  NAD+ = NAD+⇒ NADH2 (NADH2  production).

Furthermore, after pyruvate  production, with no oxygen available;the  reduced 2 NAD+ molecules  must be freed, so that they can return for Glycolysis to continue. The Lactic  fermentation pathway is needed to  remove these 2 hydrogen ions,  to convert  Pyruvate    to Lactic Acid.

This conversion requires  oxidation(removal) of all the 2 hydrogen ions of  the 2NADH, produced in glycolysis,

PYRUVATE + 2NADH   ⇒ LACTIC ACID  + NAD+

Therefore no NADH molecules are produced as end products in the conversion of  2 molecules of Glyceraldehyde-3-phosphate; to 2 molecules of Lactate.

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