Beer is largely ethanol, an alcohol molecule which is produced from glucose. Glucose is broken down to ethanol and carbon dioxide (anaerobic respiration).
Glucose--------[[Yeast]]---------> Ethanol + Carbon dioxode
Yeast supplies the enzymes to bring about this conversion.
The ethanol is the alcohol in beer. It can be flavoured by adding plants such as hops. The glucose comes from starch which is converted into maltose and then into glucose:
Starch -----[[Amylase]]----->Maltose----[[Maltase]]---->Glucose
Strach comes from sources such as barley seeds, wheat seeds and even rice. The starch is broken down through the germination of seeds, known as Malting.
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