EVERYDAY SCIENCE

Detailed explanation-1: -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-2: -Considering these 3 molecules of ATP, the total ATP synthesized by one turn of Krebs cycle is (12+3) i.e., 15 molecules of ATP.

Detailed explanation-3: -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-4: -The NADH and FADH generated during the Krebs cycle fuels the electron transport chain which drives this process, ultimately producing 38 molecules of ATP.

Detailed explanation-5: -Aerobic catabolism of glucose yields 38 ATP-34 through the oxidation of NADH and FADH2 via oxidative phosphorylation, 2 through substrate level phosphorylation (SLP) during glycolysis, and 2 (GTP) through SLP in the TCA cycle. This yield is in stark contrast to the 2 ATP produced by SLP during fermentation.