Revision notes topic questions past papers

Disaccharides and polysaccharides are broken down in hydrolysis reactions

Hydrolytic reactions are catalysed by enzymes, these are different to those present in

condensation reactions

Examples of hydrolytic reactions include the digestion of food in the alimentary tract and the

breakdown of stored carbohydrates in muscle and liver cells for use in cellular respiration

Glycosidic bonds are broken by the addition of water in a hydrolysis reaction

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CIE AS Biology (9700) 2019-2021 Revision Notes

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2. Biological Molecules

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Page 23

Sucrose is a non-reducing sugar which gives a negative result in a Benedict’s test.

When sucrose is heated with hydrochloric acid this provides the water that hydrolyses the

glycosidic bond resulting in two monosaccharides that will produce a positive Benedict’s

test