AQA A Level Biology复习笔记1.1.4 Glucose

The Two Forms of Glucose


  • The most well-known carbohydrate monomer is glucose ATP
  • Glucose has the molecular formula C6H12O6
  • Glucose is the most common monosaccharide and is of central importance to most forms of life
  • There are different types of monosaccharide formed from molecules with varying numbers of carbon atom, for example:
    • Trioses (3C) eg. glyceraldehyde
    • Pentoses (5C) eg. ribose
    • Hexoses (6C) eg. glucose


  • Glucose exists in two structurally different forms – alpha (α) glucose and beta (β) glucose and is therefore known as an isomer
    • This structural variety results in different functions between carbohydrates




Straight chain and ring structural formula of alpha & beta glucose


  • Different polysaccharides are formed from the two isomers of glucose

Structure of Polysaccharides Table