Substrate-level phosphorylation accounts for approximately what percentage of the ATP formed during glycolysis? Naim 11:56 AP Biology Chapter 9 Substrate-level phosphorylation accounts for approximately what percentage of the ATP formed during glycolysis? A. 0% B. 2% C. 10% D. 38% E. 100% Answer: E Learn More : Share this Share on FacebookTweet on TwitterPlus on Google+