BIOL133 K010 Winter 2025
ESL Chemistry of Life
Final Report
Student Name Timothy Hicks
Student ID 397832
Lesson ESL Chemistry of Life
Institution American Public University
Session 777211
Course BIOL133 K010 Winter 2025
Instructor Tracey Woodlief
Exploration
Organic molecules can be identified by the presence of carbon-hydrogen bonds.
True
False
Which type of macromolecule is composed of amino acids?
Carbohydrates
Proteins
Lipids
Nucleic acids
Exercise 1
Copyright 2025 - Science Interactive | https://scienceinteractive.com
, 1. Describe the experimental protocol you developed and followed when
testing the unknown. Be sure to include your hypothesis.
Experimental Protocol for Testing Biomolecules
Objective: To test for the presence of proteins, reducing sugars, and starches in various
solutions, including an unknown sample.
Hypothesis:
1. For proteins: If the unknown contains protein, then it will change color when tested
with Biuret solution, indicating the presence of peptide bonds.
2. For reducing sugars: If the unknown contains reducing sugars, then it will react with
Benedict's solution, resulting in a color change.
3. For starches: If the unknown contains starch, then it will change color when tested
with IKI solution, indicating the presence of starch.
Materials:
Biuret solution (for proteins)
IKI solution (for starches)
Benedict's solution (for reducing sugars)
1% glucose solution
Albumin solution (positive control for proteins)
Gelatin (for protein testing)
Potatoes (for starch testing)
Red onion (for reducing sugars and starch)
Liquid starch
Distilled water
Test tubes
Beakers
Procedure: Part 1: Testing for Proteins
1. Prepare solutions in separate test tubes: albumin solution, gelatin, 1% glucose, and
water.
2. Add Biuret solution to each test tube containing the prepared solutions.
3. Observe and record any color changes in the test tubes.
Part 2: Testing for Reducing Sugars
1. In separate test tubes, place small samples of potatoes, red onion, 1% glucose, and
water.
2. Add Benedict's solution to each test tube.
3. Heat the test tubes in a water bath for about 5–10 minutes and observe any color
changes, recording your results.
Copyright 2025 - Science Interactive | https://scienceinteractive.com
ESL Chemistry of Life
Final Report
Student Name Timothy Hicks
Student ID 397832
Lesson ESL Chemistry of Life
Institution American Public University
Session 777211
Course BIOL133 K010 Winter 2025
Instructor Tracey Woodlief
Exploration
Organic molecules can be identified by the presence of carbon-hydrogen bonds.
True
False
Which type of macromolecule is composed of amino acids?
Carbohydrates
Proteins
Lipids
Nucleic acids
Exercise 1
Copyright 2025 - Science Interactive | https://scienceinteractive.com
, 1. Describe the experimental protocol you developed and followed when
testing the unknown. Be sure to include your hypothesis.
Experimental Protocol for Testing Biomolecules
Objective: To test for the presence of proteins, reducing sugars, and starches in various
solutions, including an unknown sample.
Hypothesis:
1. For proteins: If the unknown contains protein, then it will change color when tested
with Biuret solution, indicating the presence of peptide bonds.
2. For reducing sugars: If the unknown contains reducing sugars, then it will react with
Benedict's solution, resulting in a color change.
3. For starches: If the unknown contains starch, then it will change color when tested
with IKI solution, indicating the presence of starch.
Materials:
Biuret solution (for proteins)
IKI solution (for starches)
Benedict's solution (for reducing sugars)
1% glucose solution
Albumin solution (positive control for proteins)
Gelatin (for protein testing)
Potatoes (for starch testing)
Red onion (for reducing sugars and starch)
Liquid starch
Distilled water
Test tubes
Beakers
Procedure: Part 1: Testing for Proteins
1. Prepare solutions in separate test tubes: albumin solution, gelatin, 1% glucose, and
water.
2. Add Biuret solution to each test tube containing the prepared solutions.
3. Observe and record any color changes in the test tubes.
Part 2: Testing for Reducing Sugars
1. In separate test tubes, place small samples of potatoes, red onion, 1% glucose, and
water.
2. Add Benedict's solution to each test tube.
3. Heat the test tubes in a water bath for about 5–10 minutes and observe any color
changes, recording your results.
Copyright 2025 - Science Interactive | https://scienceinteractive.com
