A comparison of the respiration of yeast in different sugar substrates.

Biology Fermentation Practical

A comparison of the respiration of yeast in different sugar substrates

Aim: The aim was to comp atomic number 18 the respiration of yeast in different substrates of sugars, i.e. between a monosaccharide (glucose) and a disaccharide (maltose)

Theory: There are three types of Carbohydrates, monosaccharides, disaccharides, and polysaccharides. The two, which I will be looking at, are, monosaccharide (glucose) and the disaccharide (maltose)

Classification and major properties of carbohydrates

GroupPropertiesExamples

Monosaccharides habitual grammatical construction:(CH20)n(n = 3 to 0)Small subatomic particles with low molecular mass; sweet preference; logical; readily dissoluble in water.Trioses, e.g. glyceraldehyde (C3H603)Hexoses e.g. glucose, fructose (C6H12O6)

Disaccharides general formula:2[(CH2O)n] - H2OSmall molecules with low molecular mass; sweet tasting; crystalline; soluble in water, but less readily than monosaccharides.Sucrose, maltose, lactose, all with the general formula C12H22O11

From the above you can already see the differences in the properties, between the monosaccharide and the disaccharide. The disaccharides are soluble but less readily than monosaccharides.

Monosaccharides

Monosaccharides contain carbon, hydrogen and oxygen, in the ration 1 : 2 : 1, so their general formula becomes (CH2O)n, where n an be any number between 3 and 9. entirely monosaccharides also contain C=O (carbonyl) sort out and at least two OH (hydroxyl) meetings.



These two conferences of atoms within the molecule are called reactive groups and play important roles in the reactions that care place within the cells.

All the sugars that occur naturally are derived from trioses. All the aldoses are formed from glyceraldehydes and all the ketones from dihydroxyacetone.

Glucose can exist in two different ring forms: one where the hydroxyl group on carbon-1 is below the ring (á-glucose) and one where the hydroxyl group is above the ring (â-glucose). These are known as á- and â-isomers, and, because the atoms and groups are arranged differently in space, are examples of stereoisomerism. The...

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