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Bio 156 Lab 2

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BIO156 ­ Lab 2


Lab 2
Biological Molecules and pH

Introduction: Connecting Your Learning
Biological organisms, like all things, are made up of elements. These elements combine to form organic molecules that create the basis for life. The main elements found in biological organisms include carbon (C), hydrogen (H), phosphorus (P), nitrogen (N), and oxygen (O). This lab describes how these elements form some of the most important molecules in life: carbohydrates, proteins, and fats.

Resources and Assignments


Lesson 2 Lab 2

From the Lab Kit
7 test tubes
Benedict's solution
Biuret solution
15 micropipettes
10 pipettes
pH test strips
4 unknown samples 1/21


BIO156 ­ Lab 2

Measuring spoons (teaspoon and tablespoon)
50 mL beaker
Mortar and pestle
Glass stirring rod
100 mL graduated cylinder
Microscope slide
Plastic funnel
Test tube tongs
Test tube rack
5 plastic cups
Plastic gloves
1 tablespoon baking soda
1 tablespoon chicken soup
4 tablespoons sugar

1 tablespoon cornstarch
2 tablespoons unflavored gelatin
Student Provided
Small saucepan
Paper towel
Oven glove or mitt
Baking tray or aluminum foil (about an 18-inch sheet)
Microwave (optional) or Stove
Permanent marker



BIO156 ­ Lab 2

25 mL of 70% isopropyl alcohol
25 mL hydrogen peroxide
25 mL lemon juice
25 mL shampoo
25 mL vinegar
2 cups distilled water
1 slice of an onion
1 teaspoon corn syrup
Roast beef lunch meat
Student choice of lunch meat (other than roast beef)…...

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