Macromolecules_Lab #2.docx - Name_Date_Class Test tube brush vegetable oil Brown paper Beaker Timer Tests for Organic Compounds Understanding the

Macromolecules_Lab #2.docx - Name_Date_Class Test tube...

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Name ____________________________________Date: __________________Class: _______ Tests for Organic Compounds Understanding the chemistry of living organisms is an important part of biology. The structures of cells are made up of many different chemical molecules. Cell metabolism involves the production and destruction of many types of molecule. Most of the common molecules found in living things belong to four classes of carbon-containing molecules: carbohydrates, lipids, proteins, and nucleic acids. OBJECTIVES Determine the presence of starch by a chemical test. Analyze a glucose solution for the presence of simple reducing sugars. Analyze a sample of vegetable oil for the presence of lipids. Analyze a sample of gelatin for the presence of protein. MATERIAL: safety goggles soluble starch solution hot plate glucose solution laboratory apron iodine solution Dropper Benedict’s solution Test tubes (3) 2% gelatin solution Test-tube rack 95% ethanol Test-tube holder biuret reagent Test tube brush vegetable oil Brown paper Beaker Timer Part A. Tests for Carbohydrates Test for Starch 1. Put on goggles and apron. 2. Test tubes should be labeled 1, 2, and 3. 3. 3 sets of test tubes in test-tube rack. 4. Using a separate dropper for each solution, add 10 drops of soluble starch solution to test tube 1 , add 10 drops of glucose solution to test tube 2 add 10 drops of water to test tube 3 . Record the color of each tube’s contents in Table 1.
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