Lab2

Lab2AnswerSheet.docx

Lab 2- The Chemistry of Life

Your Name:

INSTRUCTIONS:

· On your own and without assistance, complete this Lab 2 Answer Sheet electronically and submit it via the Assignments Folder by the date listed in the Course Schedule (under Syllabus).

· To conduct your laboratory exercises, use the Laboratory Manual located under Course Content. Read the introduction and the directions for each exercise/experiment carefully before completing the exercises/experiments and answering the questions.

· Save your Lab 2 Answer Sheet in the following format: LastName_Lab2 (e.g., Smith_Lab2).

· You should submit your document as a Word (.doc or .docx) or Rich Text Format (.rtf) file for best compatibility.

Pre-Lab Questions

What is the primary source of carbohydrates for humans?

Name one type of food that you eat that contain significant amount of carbohydrates.

What are the subunits that nucleic acids are made of? Briefly explain the difference between DNA and RNA.

How is the chemical composition of lipids different than the three other macromolecules? Name one reason why we need fat in our diet.

Briefly describe three different roles of proteins in your body and name one type of food that you eat that has high protein content.

Experiment 1: Testing for Biomolecules

Data Tables

Table 1: Testing for Proteins Results

Sample	Initial Color	Hypothesis (Protein +/-)	Final Color	Protein Present?
Albumin (1)
Gelatin (2)
Glucose (3)
Water (4)

Table 2: Testing for Reducing Sugars Results

Sample	Initial Color	Hypothesis (Reducing Sugar +/-)	Final Color	Reducing Sugar Present?
Potato (1)
Onion (2)
Glucose (3)
Water (4)

Table 3: Testing for Starch Results

Sample	Initial Color	Hypothesis (Starch +/-)	Final Color	Starch Present?
Potato (1)
Onion (2)
Starch (3)
Water (4)

Table 4: Testing an Unknown - Proteins

Sample	Initial Color	Hypothesis (Protein +/-)	Final Color	Protein Present?
Positive Control:
Negative Control:
Unknown

Table 5: Testing an Unknown – Reducing Sugars

Sample	Initial Color	Hypothesis (Reducing Sugar +/-)	Final Color	Reducing Sugar Present?
Positive Control:
Negative Control:
Unknown

Table 6: Testing an Unknown – Starch

Sample	Initial Color	Hypothesis (Starch +/-)	Final Color	Starch Present?
Positive Control:
Negative Control:
Unknown

Post-Lab Questions

1. Insert 1 picture for each of the 6 tests here:

Describe the experimental protocol you developed and followed when testing the unknown. Be sure to include your hypothesis.

Were your hypotheses confirmed by these experiments? If not, what did you find most surprising about the results?

What can you conclude about the unknown solution based on your results?

How did you use parts 1 – 3 of this experiment to inform your experimental design in part 4?

What were your positive and negative controls for each biomolecule when testing the unknown? Explain why you chose each control.

Come up with 2 – 3 practical, real-world scenarios in which testing for biomolecules would be beneficial and describe them.