Testing for biological molecules

• Protein

  biuret’s
• Protein colour negative


  blue
• Protein colour positive

  Lilac/purple
• starch

  Iodine
• Starch colour negative

  Brown
• Starch colour positive

  blue/black
• Lipids

  Ethanol and water
• Lipids colour negative

  Clear
• Lipids colour positive

  Milky white
• Sugar/glucose

  Benedicts
• sugar (water bath) positive

  green, yellow, orange or brick red
• Sugar negative

  blue
• Metabolism is the sum of all the chemical reactions in a cell or the body.
• Metabolism


  is the sum of all the chemical reactions in a cell or the body.