| Term | Definition |
| sun | the original source of energy on earth |
| photo | light |
| synthesis | to make something |
| autotrophs | organisms that make all their own organic matter |
| heterotrophs | organisms that cannot make organic molecules from inorganic ones |
| cellular respiration | the aerobic harvesting of chemical energy from organic fuel molecules |
| aerobic | presence of molecular oxygen |
| anaerobic | lacks presence of molecular oxygen |
| redox reaction | transfer of electrons and hydrogens from one substance to another |
| reduction | oxygen gains electrons and hydrogens |
| oxidation | glucose loses electrons and hydrogens |
| kreb's cycle | completes the breakdown of sugar all the way to carbon dioxide |
| glycolosis | a molecule of glucose is split into two molecules of a compound called pyruvic acid, net gain of two ATP, NADH produced for ETC |
| metabolism | the general term for all the chemical processes that occur in cells |
| ATP synthase | the turbine-like structures in mitochondrial membrane that are powered by electron transport |
| electron transport chain | a series of electron carrier molecules that shuttle electrons during the redox reactions that release energy used to make ATP |
| aerobic respiration equation | C6H12O6+6CO2 _enzymes+ATP_6CO2+6H2O+38 ATP and heat |
| faculative anaerobe | an organism with the metabolic versatility to harvest food energy by either cellular respiration or fermentation |
| obligate anaerobe | an organism that is poisoned by oxygen |
| obligate aerobe | an organism that depends on oxygen and cellular respiration to stay alive |
| fermentation | the anaerobic harvest of food energy |
| lactic acid fermentation | the conversion of pyruvate to lactate with no release of carbon dioxide |