Question

Cellular respiration generates a total of 36 to 38 ATP molecules. How many of these come solely from glycolysis?

Answer 1

During the process of Glycolysis 6 carbon glucose is broken down to 3 carbon pyruvate , which is a substrate for link reaction . By using the substrate-level  phosphorylation , it adds a phosphate to either side of the 6 carbon glucose to make the reaction unstable, which breaks it to form 3 carbon pyruvate,this process uses  2 ATP  . However , Glycolysis itself produces 4 ATP  , making it a net gain of 2 ATP .