The number of ATP molecules produced by electron transport system from Krebs cycle intermediates in a single turn is

Solution(By Examveda Team)

The number of ATP molecules produced by the electron transport system from Krebs cycle intermediates in a single turn is 12.
The tricarboxylic acid (TCA) cycle, also known as the Krebs or citric acid cycle, is the main source of energy for cells and an important part of aerobic respiration.
The cycle harnesses the available chemical energy of acetyl coenzyme A (acetyl CoA) into the reducing power of nicotinamide adenine dinucleotide (NADH).
3 molecules of ATP are synthesized when one molecule of NADH₂ is oxidized and 2 molecules of ATP are synthesized when one molecule of FADH₂ is oxidized. Thus the total ATP produced on oxidation of reduced coenzymes produced in one turn of the Krebs cycle are (3 × 3 NADH₂) + (2 × 1 FADH₂) + 1 ATP = 12 ATP molecules.