Starch is a large molecule or polymer, made from many molecules of glucose in a reaction called polymerisation. As water molecules are lost in this process, the reaction is called condensation. When food containing starch is eaten it is broken down by digestion, helped by biological catalysts called enzymes and stomach acid. Water molecules are involved in the breaking up of starch, and the reaction is described as hydrolysis. Large molecules are broken down to allow them to be absorbed into the blood. The breakdown of sucrose gives two products, one of which is found in starch, while the other is fructose.
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