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Biological Macromolecules Hands On Labs Inc Version 4202910002 Lab Report Assistant This document is not meant to be a substitute for a formal laboratory report The Lab Report Assistant is

Biological Macromolecules
Hands-On Labs, Inc.
Version 42-0291-00-02
Lab Report Assistant
This document is not meant to be a substitute for a formal
laboratory report. The Lab Report Assistant is simply a summary of the
experiment’s questions, diagrams if needed, and data tables that should be
addressed in a formal lab report. The intent is to facilitate students’ writing
of lab reports by providing this information in an editable file which can be
sent to an instructor.

Exercise 1: Starch and
Sugar
Data Table 1.Benedict’s Reagent Data.

Sample

Initial Color

Final Color

Reducing Sugar
Present in Sample? Y or N

dH2O

Albumin

Unknown

Milk

Glucose

Data Table 2. Lugol’s Iodine Data.

Sample

Initial Color

Final Color

Starch Present in
Sample? Y or N

dH2O

Albumin

Unknown

Milk

Starch

Raw Potato

Questions
A.
In each of the two
tests (starch and sugar) a positive and negative control was used. What was the
positive control in each of the tests and what was the negative control.
Explain your answers.

B.
Did the Benedict’s
test for reducing sugars net a positive or negative result for milk? Research
the sugar content of milk and the definition of a reducing sugar to explain if
your result is what you would expect.

C.
Based on your
results, is sugar and/or starch present in your Unknown? Use your results to
explain your answer.

Exercise 2: Proteins and
Lipids
Data
Table 3. Biuret’s Reagent Data.

Sample

Initial Color

Intermediate Color

Final Color

Protein Present in
Sample? Y or N

dH2O

Albumin

Unknown

Milk

Data Table 4. Lipid Observations.

Sample

Sample Observations

Lipid Present in
Sample? Y or N

Distilled water

Albumin

Unknown

Milk

Vegetable oil

Questions
A.
Review the Data Tables in Exercises 1 and 2.
Compare the results of the Unknown for all tests to the results for the various
known samples to determine the identity of the Unknown. Explain the identity of
the Unknown using your experiment results in the exercises to help explain and
support your answer.

B.
Eggs are known to
contain cholesterol which is a lipid. Did your experiment results indicate a
presence of lipids in the albumin solution? Think about this result and where
cholesterol is present in eggs to explain how your results support or reject
cholesterol in eggs. How could you test this? Explain the experiment that you
would perform to test this.

 

Jun 20 2020 View more View Less

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