Biology notes – 9/8

August 9thC

Chemicalsof life (Ch. 4)

Note taking


-We call them chemicals of life as it is what we are made of.

-These are carbohydrates, lipids and proteins.


  • There are small carbohydrates with only one sugar, called monosaccharide. This is soluble in water.

E.g; Glucose

  • An example of monosaccharide  is glucose or fructose.
  • When monosaccharide get together, a disaccharide is formed. This is soluble in water, and therefore, storages energy. An example of disaccharide is starch (plants) or glycogen (animals).
  • When a long chain of many carbohydrates is formed, it is called polysaccharide. This isn’t soluble in water and it is heavy. An example is sucrose.
  • Carbohydrates are the body’s main source of energy and storages it too. They contain the elements carbon, hydrogen and oxygen.
  • C-H-O


  • C-H-O
  • Function; To store energy as fats.


  • C-H-O-Nς