Qualitative Tests for Biological Molecules Exercise 3 Lab

3 Amino Acid Solution Color Change + Presence of protein 4 Glucose Solution No Color Change - No Presence of proteins 5 Vegetable Oil No Color Change - No Presence of proteins 6 Egg Albumen Solution Color Change + Presence of protein 7 DNA Solution No Color Change - No Presence of proteins 8 Starch Solution No Color Change - No Presence of proteins 1. - Positive: {known protein, amino acid, & egg albumen} - Negative: {dH 2 O, glucose, vegetable, DNA, & starch} 2. The results report what you found, without speculating on why you found these results. The interpretation is the meaning of the results, puts them in context, and explains why they matter. 3. The distilled water is devoid of any minerals or salts, it’s a negative solution. 4. Test Tubes 2, 3, & 6. 5. Free amino acids lack peptide bonds because they function as monomers that multiply & link by peptide bonds to form a protein chain. A free amino acid has two groups: a carbonyl group (- COOH) & a -NH2 group. At a minimum, two amino acids must be connected by a peptide chain to form a protein chain.  Procedure 3.4: Separation of Phase as a Test for the Presence of Lipids Test Tube Contents Results (+) or (-) Interpretation 1 dH 2 o Miscibl e - No Separation 2 known DNA solution Miscibl e - No Separation 3 Amino Acid Solution Miscibl e - No Separation 4 Glucose Solution Miscibl e - No Separation 5 Vegetable Oil Immisci ble + Separation 6 Egg Albumen Solution Immisci ble + Separation 7 RNA Solution Miscibl e - No Separation 1. - Positive: {Vegetable oil & Egg Albumen} - Negative: {dH 2 o, known DNA, amino acid, glucose, & RNA}