| A | B |
| calorie | amount of energy needed to raise temperature of 1 gram of water 1 degrees celsius |
| glycolysis | the process begins with a pathway |
| cellular respiration | the process that release energy by breaking down glucose and other food molecules in the presence of oxygen |
| NAD+ | electron carrier involved in glycolysis |
| fermentation | process by which cells release energy in the absence of oxygen |
| anaerobic | process that does not need oxygen |
| aerobic | process that requires oxygen |
| Krebs cycle | second stage of cellular respiration, in which pyruvic acid is broken down into carbon dioxide in a series of energy-extracting reactions |
| electron transport chain | a series of protein in which the high-energy electrons from kreb cycle are used to convert ADP into ATP |