disaccharides Archives | School Portal NG

DISACCHARIDES - WELL EXPLAINED These contain two monosaccharide units. The chemical process through which a large molecule (e.g a disaccharide) is formed from smaller molecules is called condensation and it involves loss of water Common examples of disaccharides include sucrose, maltose and lactose Disaccharides are broken into their monosaccharide units by heating with dilute hydrochloric acid This is known as hydrolysis and involves addition of water molecules The same process takes place inside cells through enzymes Sucrose + water hydrolysis-----------------glucose+fructose Properties of Disaccharides Sweet tasting Soluble in water Crystallisable Maltose and lactose are reducing sugars while sucrose is non-reducing sugar Sucrose is the form in which carbohydrate is transported in plants: This is because it is soluble andjchernically stable Sucrose is a storage carbohydrate in some plants e.g sugar-cane and sugar-beet Disaccharides are hydrolysed to produce monosaccharide units which are readily metabolised by cell to provide energy. Also See: PROCESS OF PHOTOSYNTHESIS NUTRITION IN PLANTS BIOLOGY PRACTICAL ACTIVE TRANSPORT WATER RELATIONS IN PLANT AND ANIMAL CELLS

DISACCHARIDES – WELL EXPLAINED