| Word | Description |
| Q | A symbol which is used in measuring cell respiration in the Warburg manometer; the number of microlitres of oxygen consumed (or carbon dioxide or other gas produced) per mg dry weight of tissue per hour. |
| Q-enzyme | A factor which is isolated from potatoes that catalyses the formation of branching linkages of the 1,6 - alpha type in starches; the reaction appears to be irreverisble, i.e. the Q- enzyme cannot hydrolyse these ,6 alpha linkages. |
| Quart, Reputed | Customary measure in relation to bottled wine and spirits is a 'bottle' known as a reputed quart, approximately two-third of an imperial quart, or 26 fluid ounces. Reputed pints is 13 flui ounces. |
| Quebracho | Or aspidosperma. It is obtained from the bark of aspidosperma quebracholbanco; used as source of tannins and alkaloids. |
| Queen substance | Refers to the material secreted by the queen bee which inhibits the ovaries of the worker bees and stops them contructing queen cells. Thought to be chemically 10-hydroxy delta -2-decenoic acid. |
| Quenelle | Refers to a ball of chopped spiced meat or fish. |
| Quercetin | Refers to a flavone found in onion skins, tea, hops, horse, chestnuts; the disaccharide derivative hving rhamnose and glucose in routine. |
| Quetelet's Index | Index of adiposity; weight (kg) divided by square of height (metres); 25 considered 'normal'. |
| Quick Breads | Term for baked goods like bisuits, muffins, popovers, griddles, cakes, waffles and dumplings, in which no yeast in used, but the raising carried out quickly with baking powder or other chemical agents. |
| Quick Freezing | A rapid freezing of food by exposure to a blast of air at a very low temperature. Unlike slow freezing, small crystals of ice get formed which do not rupture the cells of the food and so the structure is relatively undamaged. A quick frozen food is comm |
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