Revision notes topic questions past papers

Disaccharides and polysaccharides are formed when two hydroxyl (-OH) groups (on

different saccharides) interact to form a strong covalent bond called the glycosidic bond

(the oxygen link that holds the two molecules together)

Every glycosidic bond results in one water molecule being removed, thus glycosidic bonds

are formed by condensation

The formation of a glycosidic bond by condensation between two monosaccharides

(glucose) to form a disaccharide (maltose)

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CIE AS Biology (9700) 2019-2021 Revision Notes

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2. Biological Molecules

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CIE AS Biology (9700) 2019-2021 Resources

REVISION NOTES 

 

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Page 20

Each glycosidic bond is catalysed by enzymes specific to which OH groups are interacting

As there are many different monosaccharides this results in different types of glycosidic

bonds forming (e.g maltose has a α-1,4 glycosidic bond and sucrose has a α-1,2 glycosidic

bond)

The formation of a glycosidic bond by condensation between α-glucose and β-fructose to