Describe the process of the Krebs cycle.

Acetyl CoA (2 carbon compound) from the link reaction combines with a 4 carbon compound called oxaloacetate. This reaction releases the CoA enzyme allowing it to be re-used. The now 6 carbon compound (citric acid) releases Co₂ to leaving a 5 carbon compound. This reaction also produces NADH, from the coenzyme NAD⁺ The 5 carbon compound then converts back into the 4 carbon by releasing  Co₂  , 2 NADH, 2FADH₂ and  ATP, from ADP and P_I.. The cycle can then be repeated. For each molecule of glucose the cycle occurs twice as two acetyl CoA are produced.