Download Virtual Macromolecules Lab

Virtual Macromolecules Lab
Lab Directions
This lab activity is a virtual lab, meaning you will conduct all of it online at the following
website. Use the directions below to navigate through the activity and answer the
questions below. Then, take the “Virtual Macromolecules Lab” Quiz using your answers
to this lab.
Overview:
In this lab assignment, you will visit the Oklahoma Community College’s Organic Molecules
website to learn how scientists test foods for different biochemicals. Then you will test a variety
of foods (virtually) to see which macromolecules they contain.
Click to view the website we will use in this lab:
http://www.occc.edu/biologylabs/Documents/Organic%20Compounds/Organic%20Compounds.ht
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Part 1: Learn about Each Macromolecule Test
Read through the first page of the lab pictured above.
Carbohydrates Tests (there are two):
Click on the Carbohydrates link. Click through the activity to learn how to test for simple sugars
(Benedict’s Test) and for starches (Iodine Test).
1.List the steps and reagent used to test for simple sugars:
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2.Complete the table below to indicate what a positive and negative test for simple sugars
looks like.
3.List the steps and reagent used to test for starch:
4.Complete the table below to indicate what a positive and negative test for starch looks like.
Proteins Test:
From the main page, click on the Proteins link. Click through the activity to learn how to test for
proteins with the Biuret Test.
5.List the steps and reagent used to test for proteins:
6.Complete the table below to indicate what a positive and negative test for proteins looks like.
Lipids Test:
From the main page, click on the Lipids link. Click through the activity to learn how to test for
lipids with Sudan IV.
7.List the steps and reagent used to test for lipids:
8.Complete the table below to indicate what a positive and negative test for lipids looks like.
Table 1. Macromolecule Test Indicator Table (some of this has been started for you…)
Test
Simple Sugars
Reagent Used
Benedict’s
Negative Test Result
Positive Test Result
blue
Starch
Protein
Lipid
Part 2: Food Testing
Now you will test a series of foods with each of the four tests you examine above. Go back to
the main page and click on Foods. Choose each food and test it with all four tests.
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Record your testing results for each the following foods from the website: (Potatoes is done for
you.)
Food
Potatoes
Simple Sugar Test
(Benedict’s)
Starch Test
(Iodine)
-
+
Protein Test
(Biuret)
Lipids
Test
-
-
Orange
Juice
Almonds
Eggs
Salmon
Milk
Take the Quiz Using Your Recorded Answers:
Go back to the course and take the “Virtual Macromolecules Lab” Quiz using your
answers to this lab.
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