PAG Breakdown and Testing of Biological Molecules



This video describes how enzymes are used to digest proteins, carbohydrates and lipids in the body. The monomers are then used in either respiration or building new molecules. Part of this video covers the practical activity on how to test for protein, starch, sugars and lipids in food, focusing on the chemical used and the colour changes that indicate a positive result. All students may actually do this experiment in class, however, this experiment is only specifically for Biology Triple students, so there is a chance that a related question may appear in the Biology only papers.

Key Words

polymer, carbohydrates, ethanol, sugars, monomer, fatty acid, protein, lipid, amino acid, bile, carbohydrase, pancreas iodine, protease, Benedict's, lipase, Sudan III, glycerol, Biuret.