During the complete oxidation of glucose, the proportion of ATP formed by substrate-level phosphorylation is ______.

Step-by-step solution

Respiration is the process or mechanism to break down food molecules to release energy in the form of ATP. During the process of aerobic respiration, phosphorylation of ADP occurs forming the energy currency molecule - Adenosine triphosphate. The energy required for the production of proton gradient which is needed for phosphorylation is obtained from the oxidation-reduction of the molecules. One of the steps of the respiration process is glycolysis where 6C-glucose is broken down to 3C-pyruvate. In the first step