| Process ID | Gene number | Process name |
| GO:0006099 | 22 | A nearly universal metabolic pathway in which the acetyl group of acetyl coenzyme A is effectively oxidized to two CO2 and four pairs of electrons are transferred to coenzymes. The acetyl group combines with oxaloacetate to form citrate, which undergoes successive transformations to isocitrate, 2-oxoglutarate, succinyl-CoA, succinate, fumarate, malate, and oxaloacetate again, thus completing the cycle. In eukaryotes the tricarboxylic acid is confined to the mitochondria. See also glyoxylate cycle. |
| GO:0019332 | 0 | The oxidation of nitrite (NO2) to nitrate (NO3), using oxygen (O2) as the electron acceptor. Nitrite oxidation is the final step in nitrification, the oxidation of ammonia to nitrate, and nitrite oxidoreductase (NOR) is the key enzyme complex that catalyzes the conversion of nitrite to nitrate in nitrite oxidizing species. |
| GO:0019409 | 0 | The metabolic process by which ammonia (NH3) is oxidized to nitrite (NO2) in the presence of oxygen; enzymatic reactions convert ammonia to hydrazine, and hydrazine to nitrite. |
| GO:0019410 | 0 | The metabolic process by which carbon monoxide (CO) is oxidized to carbon dioxide (CO2) to generate energy. Conservation of energy in this process likely uses sodium ion gradients for ATP synthesis and is coupled to quantitative sulfide methylation. |
| GO:0019411 | 0 | The metabolic process by which ferrous ions (Fe2+) are oxidized to ferric ions (Fe3+) to generate energy, coupled to the reduction of carbon dioxide. |
| GO:0019412 | 0 | The oxidation of hydrogen (H2) to water (H2O), using oxygen (O2) as the electron acceptor. A hydrogenase enzyme binds H2 and the hydrogen atoms are passed through an electron transfer chain to O2 to form water. |
| GO:0019414 | 0 | |
| GO:0043554 | 0 | The oxidation of arsenite to arsenate, using oxygen (O2) as the electron acceptor. Arsenite oxidase provides electrons to an electron carrier which transfers them to oxygen utilizing respiratory systems. |
