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bio ch 5 vocab
| Question | Answer |
|---|---|
| aerobic | occurring or living in the presence of free or dissolved oxygen |
| anaerobic | occurring or living in conditions without free or dissolved oxygen |
| coenzyme A | a coenzyme, a small molecule required for enzymatic activity, present in all cells; necessary for cell respiration and fatty-acid metabolism |
| cytochrome | an electron-carrying pigment in electron transport systems; cytochrome c is the most abundant |
| electron transport system | the process in which electrons transfer from one carrier molecule to another in photosynthesis and in cell respiration; results in storage of some of the energy in ATP molecules |
| facultative aerobe | an organism that is normally anaerobic but can also grow in the presence of oxygen |
| FAD | flavin adenine dinucleotide; combines with two hydrogen atoms during cell respiration to form FADH2 |
| fermentation | the release of energy during the chemical breakdown of food, especially sugars, in the absence of oxygen |
| glycolysis | the initial breakdown of a carbohydrate, usually glucose, into smaller molecules at the beginning of cell respiration or fermentation |
| hydrolysis | the splitting of a molecule by reaction with water |
| Krebs cycle | the cycle in cell respiration that completes the breakdown of the intermediate products of glycolysis, releasing energy; also, a source of carbon skeletons for use in biosynthesis reactions |
| lactate | in mammals, to secrete milk; in chemistry, the ion of a 3-carbon acid (lactic acid) formed from pyruvic acid in fermentation |
| lactic acid | substance that forms from pyruvic acid when glycolysis occurs in the absence of oxygen |
| lactic-acid fermentation | an anaerobic pathway producing ATP when the conversion of pyruvate to lactate produces NAD_, which cycles back through glycolysis |
| mitochondria | the organelles in eukaryotic cells that carry on cell respiration; the site of ATP synthesis and of the Krebs cycle |
| NAD | nicotinamide adenine dinucleotide; an electron and hydrogen carrier in cell respiration |
| obligate aerobe | a microorganism that requires oxygen to live |
| obligate anaerobe | a microorganism that lives without using oxygen (an anaerobe) and finds the presence of oxygen harmful |
| pyruvic acid | 3-carbon compound that is the end product of glycolysis |