17 Aug Question: Table 1: Testing For Proteins Results Sample Initial Color Final Color Protein Present 1 – Albumin Solution 2 – Gelatin Solution 3 – Glucose 4 – Water 5 – Unknown Post-Lab Questions Record Your Hypothesis About What Will Happen When Biuret Solution Is Mixed With The Solutions From Test Tubes 1, 2, 3, And 4 Here. Be Sure To Use Scientific Reasoning …
| Table 1: Testing for Proteins Results | |||
| Sample | Initial Color | Final Color | Protein Present |
| 1 – Albumin Solution | |||
| 2 – Gelatin Solution | |||
| 3 – Glucose | |||
| 4 – Water | |||
| 5 – Unknown | |||
Post-Lab Questions
- Record your hypothesis about what will happen when Biuret solution is mixed with the solutions from test tubes 1, 2, 3, and 4 here. Be sure to use scientific reasoning to support your hypothesis.
- Write a statement to explain the molecular composition of the unknown solution based on the results obtained during testing with the Biuret solution and each sample solution.
- Diet and nutrition are closely linked to the study of biomolecules. How should you monitor your food intake to insure the cells in your body have the materials necessary to function?
- There are other types of reagents used to determine what type of biomolecule a substance is. For example, copper ions present in Benedict’s reagent reacts with the free end of any reducing sugars, such as glucose, when heated. Originally blue in color, these copper ions are reduced by the sugar, and produce an orange-red colored precipitate. Alternatively, iodine-potassium iodide (IKI) may also be used when working with starch. IKI contains special tri-iodine ions which interact with the coiled structure of a starch polymer. Prior to a reaction, the IKI displays a yellow-brown color; however, after reacting with starch, a dark purple or black color is presented.
The molecule pictured below produced a blue color when tested with Benedict’s reagent, a yellow color when tested with IKI, and a violet color when tested with Biuret reagent. Based on the structure shown below and these chemical results, what kind of biomolecule is this?
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