In the citric acid cycle (also called the Krebs cycle), ATP molecules are produced by _____. Top 1000 Questions In the citric acid cycle (also called the Krebs cycle), ATP molecules are produced by _____.a. cellular respirationb. photosynthesisc. photophosphorylationd. substrate-level phosphorylatione. oxidative phosphorylationAnswer: d Learn More : Share this Share on FacebookTweet on TwitterPlus on Google+