Disaccharides (AQA AS Biology): Revision Note
Exam code: 7401
Disaccharides: common examples
Monosaccharides can join together via condensation reactions to form disaccharides
The new chemical bond that forms between two monosaccharides is known as a glycosidic bond
Common examples of disaccharides include:
maltose (the sugar formed in the production and breakdown of starch)
sucrose (the main sugar produced in plants)
lactose (a sugar found only in milk)
All three of the common examples above have the formula C12H22O11, but are comprised of different monomers
Disaccaride | Monosaccharide compondents | |
|---|---|---|
Maltose | α-glucose | α-glucose |
Sucrose | α-glucose | Fructose |
Lactose | α-glucose | Galactose |
Examiner Tips and Tricks
Like glucose, galactose and fructose are monosaccharides and have the same molecular formula as glucose. However, the atoms that make up these three monosaccharides are arranged in different ways, meaning they each have slightly different molecular structures, giving them slightly different properties.
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