Krebs's cycle or citric acid cycle or T.C.A. ( Tricarboxylic acid. ) cycle part of 'biological oxidation' gives maximum energy. As in this part of biological oxidation that oxygen is used to get 6 carbon bi oxide and 6 water molecules. About 70 % of the ATP molecules are produced in Krebs's cycle.
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Aerobic respiration produces the most ATP per molecule of glucose. This process includes glycolysis, the Krebs cycle, and the electron transport chain, yielding a total of around 36-38 ATP molecules.
Substrate-level phosphorylation in glycolysis produces 4 ATP molecules from one molecule of glucose, but 2 ATP molecules are initially used to initiate the process. This results in a net gain of 2 ATP molecules per molecule of glucose.
In glycolysis, one glucose molecule produces a net yield of two ATP molecules at the end of the process.
During glycolysis, the overall gain of ATP per glucose molecule is 2. While glycolysis produces 4 ATPs, it uses 2 ATPs in the process.
The molecule needed to initiate the process of glycolysis is glucose.
To energize glucose molecules at the start of a process, ATP (adenosine triphosphate) is invested. This ATP is used to phosphorylate the glucose molecule, providing the initial energy needed to start the process of glycolysis or aerobic respiration.