DENDROLOGY

TREE PHYSIOLOGY

RESPIRATION

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
How many ATP molecules are formed from three molecules of acetyl CoA in Krebs cycle excluding electron transport chain?
A
5
B
3
C
6
D
33
Explanation: 

Detailed explanation-1: -So, the correct answer is 12 ATP.

Detailed explanation-2: -Each acetyl CoA enters into citric acid cycle and yields 3 NADH2 (9 ATP), 1 FADH2 (2 ATP) and 1 GTP (1 ATP). Therefore, altogether 12 ATP molecules will be produced from each mole of acetyl-CoA.

Detailed explanation-3: -The Krebs cycle is the second phase in cellular respiration. It occurs in the mitochondria in the cell. The number of ATP molecules produced in the Krebs cycle is 2.

Detailed explanation-4: -The electron transport chain then generates additional ATPs by oxidative phosphorylation. The citric acid cycle also produces 2 ATP by substrate phosphorylation and plays an important role in the flow of carbon through the cell by supplying precursor metabolites for various biosynthetic pathways.

Detailed explanation-5: -In the Krebs cycle, two ATP, six NADH +H+, and two FADH2 were produced. A net of four ATPs was produced from glycolysis through the Krebs cycle.

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