Lab:2 bBiology

BIOL 1115 Human Biology

Chemistry of Life Lab

Part I: The Elements

Using Table 2.2 (pg. 29) from your lecture book, Johnson Human Biology, pick one of the most common important elements in living organism and answer the following questions:

1. List the name and atomic symbol of the element you picked:

2. Atomic number?

a. Define the term atomic number:

b. What is the atomic number of your element:

3. Atomic Mass?

a. Define the term atomic mass:

b. What is the atomic mass of your element:

4. What percent of human weight is composed of your element?

5. What is the function and the types of organic molecules where you could find your element?

Part II: The Macromolecules

Run through Macromolecule Virtual Lab and fill in the charts below to learn about which macromolecules are found in various food items. Hint: A positive result means the macromolecule is present in the tube and a negative (-) result means the macromolecule is absent from the tube.

Test for Carbohydrates

Contents of Tube:	Results (Color Change):	Results (+/-) for Simple Sugar:
Water + Benedict’s Reagent
Glucose + Benedict’s Reagent

Contents of Tube:	Results (Color Change):	Results (+/-) for Starch:
Water + Iodine
Starch + Iodine

Test for Proteins

Contents of Tube:	Results (Color Change):	Results (+/-) for Protein:
Water + Biuret Reagent
Protein + Biuret Reagent

Test for Fats (Lipids)

Contents of Tube:	Results (Color Change):	Results (+/-) for Fat:
Water + Sudan IV
Vegetable Oil + Sudan IV

Testing Food Substances:

Food Substance	Results (+/-) for Simple Sugar:	Results (+/-) for Starch:	Results (+/-) for Protein:	Results (+/-) for Fat:
Potato
Orange Juice
Nuts
Eggs
Salmon
Milk

1. What kinds(s) of biological molecules(s) are found in significant concentration in each food?

2. Did you find any of the food substances that appeared to be relatively simple, providing only one of the biological molecules?

3. Did you find any food substances that appeared to be complex, providing multiple kinds of biological molecules?