Biological molecules and food tests

• what is structure of carbohydrate?

  • contains elements - carbon, hydrogen and oxygen
  • Starch and glycogen - large, complex carbohydrates - made up of many smaller units - joined together in long chain
• what is structure of proteins?

  • made of long chain of amino acids
  • all contain carbon, nitrogen, hydrogen and oxygen atoms
• what is structure of lipid?

  • lipid - built from fatty acids and glycerol
  • lipid contains - carbon, hydrogen and oxygen atoms
• how to prep food sample?

  • get piece of food and break it using pestle and mortar
  • transfer ground up food to beaker - add distilled water
  • give mixture good stir with glass rod - dissolve some of food
  • filter solution using funnel lined with filter paper - remove solid parts of food