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AS and A Level: Molecules & Cells

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  1. Food Test. Aim: To conduct tests for reducing and non-reducing sugars, starch, lipids and proteins

    Also, in this experiment, the observations during each food test would be recorded and the colour changes would be observed to identify whether each food contain any of the macromolecules which are being tested. Materials/Apparatus: * Glucose solution * Sucrose solution * Starch solution * Iodine/ Potassium Iodide solution * Copper Sulphate solution * Sodium Hydrogen Carbonate solution * Ethanol (90%) * Potassium Hydroxide * Cold water * Vegetable oil * Egg albumen * Bread crumbs * Crushed potato * Test tubes * Test tube holders * Test tube rack * Measuring cylinder * Water bath * Pasteur pipette (dropper)

    • Word count: 1336
  2. Report comparing different growth media, aseptic techniques and laboratory safety with own experiences

    Contact with broken glassware is prohibited and decontamination of sharp material before disposal is strictly required. Therefore, category 2 laboratories are required to provide special safety facilities and equipment such as the laminar flow cabinet which provides a sterile - particle-free- working environment with the help of air projecting through a system of filtration and carrying it across a working surface in a laminar air stream. There are three classes in biosafety cabinets, class I & II can be used in group 1,2 & 3 Microbiology Laboratories; whereas a class III cabinet will be used in a group 4 Microbiology Laboratory.

    • Word count: 1055

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