Monosaccharides and disaccharides

• Describe the difference between alpha and beta glucose

  Beta glucose has the right hand side hydroxyl and hydrogen groups inverted.
• Describe the biochemical test for reducing sugar

  Add an equal volume of Benedicts solution and heat in a water bath. If glucose is present it will go from blue to green, to yellow, to orange, to brick red precipitate
• describe the biochemical test for non reducing sugar

  Add an equal volume of Benedicts solution and heat in a water bath. If a non-reducing sugar is present there will be no colour change. Take a fresh sample, hydrolyse by heating with acid, then add sodium hydrogen carbonate to neutralise.

  Add benedicts and heat, a positive result is a brick red precipitate.
• what is glucose used for

  to release ATP during aerobic respiration
• what reaction joins two monosaccharides together

  Condensation reaction releasing water
• what reaction breaks a disaccharide

  Hydrolysis using water
• what is the bond between two monosaccharides called

  glycosidic
• What is it called when two molecules both ave the same chemical formula but have different structures

  Isomers