Yeast is one of the oraganisms most useful to people.
When the have plenty of oxygen yest cells respire AEROBICALLY. - Break down sugar to provide energy for the cells. - Produce water and carbon dioxide.
When yeast break down sugar in the absence of oygen they repsire ANAEROBICALLY and produce ethanol and carbon dioxide. Anaerobic respiration of yeast is somethimes called fermemntaion.
Bread
Beer
Wine
Yoghurt
Microorganism
Yeast
Yeast
Yeast
Bacteria
Sugar Supply
Sugar added to flour
Starch in barley broken down into sugar (malting)
Grapes
Milk sugar (LACTOSE)
Result
Carbon dioxide makes bread rise
Alcohol – hopes add flavour
Alcohol – flavour depends on grapes
Lactic acid clots and thickens milk.
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