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Biomolecules Lab Report

The student conducted lab tests on the contents of a victim's stomach to identify biomolecules. Lipid tests turned red, indicating lipids were present. Protein tests turned purple, confirming the presence of proteins. However, carbohydrate tests for glucose and starch were negative, meaning neither glucose nor starch were detected in the stomach contents.

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167 views2 pages

Biomolecules Lab Report

The student conducted lab tests on the contents of a victim's stomach to identify biomolecules. Lipid tests turned red, indicating lipids were present. Protein tests turned purple, confirming the presence of proteins. However, carbohydrate tests for glucose and starch were negative, meaning neither glucose nor starch were detected in the stomach contents.

Uploaded by

api-374279896
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Julianna Alvarado

PAP Biology - 4th


Lafferty
26 October 20

Biomolecules Lab Report


Our goal for our lab was to determine if the contents of the victims stomach had carbohydrates, lipids, or
proteins.

Table 1. Positive and Negative Results for the Presence of Organic Molecules
Macromolecules Chemical Test Positive Test Results Negative Test Results

Lipids Sudan IV Red oil droplets Red solution

Proteins Biuret Purple Blue

Carbohydrates - Benedicts Bright orange Blue


Glucose

Carbohydrates - Iodine Deep purple Yellow


Starch
The last tube is water and stomach contents.

Table 2. Observations for Testing Organic Molecules


Test for Lipids Test for Proteins Test for Glucose Test for Starch

Observations: Observations: Observations: Observations:


When mixing the stomach When mixing water, When mixing water, When mixing water,
contents, water, and Sudan stomach contents, and stomach contents, and stomach contents, and
IV the three had mixed Biuret they mixed and the Benedict's putting the tube Iodine then shaking it a few
together and it turned red. substance turned a light in boiling water for about times the substance turned
purple. five minutes the substance black.
Tube #1 turned a yellow-green.
Tube #2 Tube #4
Tube #3

Present? ________ Present? ________ Present? ________ Present? ________

Not Present? _______ Not Present? _______ Not Present? _______ Not Present? _______

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