Each turn of the citric acid cycle produces how many NADH molecules?

1. Every turn of the cycle harvests electrons at several oxidation steps. 2. Those electrons are loaded onto two different carriers. 3. Each turn of the cycle forms three NADH molecules and one FADH2 molecule. 4. One ATP or GTP is also produced by substrate-level phosphorylation. _Source: OpenStax Biology for AP(R) Courses (CC BY 4.0), Ch 7 'Cellular Respiration', sections 7.1-7.7_