Question

From one pyruvate passing through Kreb's cycle, how many NADH are formed?
A. 1
B. 2
C. 3
D. 4​

Answer 1

Answer:

3 NADH

Explanation:

The two acetyl carbon atoms will eventually be released on later turns ofthe cycle; thus, all six carbon atoms from the original glucose molecule are eventually incorporated into carbon dioxide. Each turn of the cycle forms three NADH molecules and one FADH2molecule.

Answer 2

Answer:

From one pyruvate passing through Kreb's cycle, 3 NADH are formed.

So, option C is the correct answer.

Know more about Kreb's cycle: The stage of respiration in which the pyruvic acid produced in glycolysis is completely oxidized to form various organic acids produces CO2 water and energy in a cyclical pathway, called the Krebs cycle.Since citric acid is the first product among the various organic acids produced in the Krebs cycle, this cycle is called the citric acid cycle.Because citric acid has three carboxyl groups (-COOH), it is called tricarboxylic acid cycle or TCA cycle and it is called Krebs cycle after the first observer English scientist Hans Krebs (1937).In the second stage of respiration, in the presence of oxygen, pyruvic acid enters the Krebs cycle by producing acetyl CO-A with the help of coenzyme A and reacts with oxalo-acetic acid (4-C) to produce citric acid (6C).This citric acid is converted back into oxalo-acetic acid (4-C) with the help of various catalysts and formation of several intermediate compounds. In the Krebs cycle, pyruvic acid is completely oxidized with 6 molecules of oxygen to produce 6 molecules of CO2, 6 molecules of H20 and 686 Kcal of energy. Each respiration produces a total of 38 molecules of ATP.

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