Murder And Meal Lab Analysis Essay

Pat McGurrin October 24, 2015
Period #1 Honors Biology Mr. Dinunzio
Murder and Meal Lab Analysis
Procedure:
1.) Gather all materials: Safety goggles, 250ml beaker, water, hot-plate, test-tubes, paper bag tear, stomach contents, pipette, Biruet solution, Benedict’s solution, and Iodine solution.
2.) Put on safety glasses.
3.) Use the pipette to gather a small amount of the stomach contents.
4.) Lipid Test: Apply the stomach solution onto the paper bag tear. If a translucent spot appears, it is a positive result and there are lipids present in the stomach contents. If the paper bag tear does not have a translucent spot, it is a negative result and there are not lipids present in the stomach contents.
5.) Protein Test:

Results and Observations for Organic Macromolecule Presence Tests
Test for Lipids Test for Proteins Test for Glucose Test for Starch
Observations: Observations: Observations: Observations:
Paper-bag has a translucent spot The stomach contents became purple The stomach remained blue The stomach contents became black
Present? Yes Present? Yes Present? ___ Present? Yes
Not Present? ___ Not Present? ___ Not Present? Yes Not Present? ___

Data Analysis &

The information was gathered through multiple tests which are used to detect the presence of certain macromolecules in the victim’s stomach contents. Then, the detective will be able to pin-point which restaurant the victim last ate at by checking the foods of the restaurants and the victim’s stomach contents to see if they will parallel each other. The detectives know that the victim’s last meal was pizza at Anthony Franco’s because the three macromolecules that were found in the victim’s stomach can also be found in pizza. Lipids were found in the stomach solution through a positive result from the paper bag test. Lipids make up the grease and oil that typically saturates the crust after cooking. Proteins were found in the victim’s stomach contents by exposing the contents to the Biuret solution and getting a positive result after the solution became purple. Protein can also be found in the meat of the victims typical, “…pizza with sausage, pepperoni, and bacon…”. Lastly, starches were found in the victim’s stomach contents though exposing the victim’s stomach contents to the Iodine solution and getting a positive result after the solution became a dark color. In pizza, starches can be found in the entire