DISACCHARIDES

Biology

DISACCHARIDES

  • 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.
See also  COMPARISON BETWEEN ANIMAL CELL AND PLANT CELL

Also See:

PROCESS OF PHOTOSYNTHESIS

NUTRITION IN PLANTS

BIOLOGY PRACTICAL

ACTIVE TRANSPORT

WATER RELATIONS IN PLANT AND ANIMAL CELLS

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