| A | B |
| acetyl-CoA | molecule made in transition reactions to Krebs cycle |
| aerobic respiration | breakdown of glucose into carbon dioxide, and water in the presence of oxygen - energy released used to make ATP |
| cellular respiration | breakdown of organic molecules to release energy for ATP production |
| electron transport system | transport of electrons through series of membrane proteins from high energy to low energy |
| FAD | coenzyme used in Krebs cycle to carry electrons from succinate |
| Krebs cycle | series of reactions that decarboxylates pyruvate and releases energy for ATP production |
| metabolic pool | intermediates from one metabolic pathway that can be used to make other molecules |
| NAD+ | coenzyme used to accept electrons in glycolysis and Krebs cycle |
| oxidative phosphorylation | aerobic production of ATP by chemiosmotic coupling |
| oxygen debt | aerobic reconversion of lactate to pyruvate |
| fermentation | anaerobic breakdown of organic molecules to make ATP |
| substrate-level phosphorylation | transfer of a phosphate from one molecule to another |
| transition reaction | reaction outside the Krebs cycle proper - converts pyruvate to AcCoA |
| glycolysis | anaerobic breakdown of glucose to two pyruvates - results in net gain of 2 ATP and 2 NADH |