Student Exploration: Identifying Nutrients
Vocabulary: carbohydrate, disaccharide, lipid, monosaccharide, polysaccharide, protein, starch
Prior Knowledge Questions (Do these BEFORE using the Gizmo.)
1. What are the ma
...
Student Exploration: Identifying Nutrients
Vocabulary: carbohydrate, disaccharide, lipid, monosaccharide, polysaccharide, protein, starch
Prior Knowledge Questions (Do these BEFORE using the Gizmo.)
1. What are the major types of nutrients (macromolecules) you can get from food? (see
vocabulary above for help) [ Proteins, Carbs, Lipids. ]
2. How are these nutrients used by your body? [ Proteins help rebuild muscles, while carbs
provide the body with energy. Lipids store fat for energy.]
Gizmo Warm-up
Have you ever wondered what is in your food? Scientists
use a variety of tests to determine the nutritional content of
food. You will learn four of those tests with the Identifying
Nutrients Gizmo™.
1. Below the Food samples label, drag tube A into the
Food sample holder. Below the Benedict test, click
the Test button. Explain what is done during the
Benedict test.
[ A drop of the solution is added to the test tube and put in heated water.]
2. The Benedict test is a test for monosaccharides; simple sugars like glucose or fructose
(fruit sugar). In contact with monosaccharides, the Benedict solution turns from blue to pink.
Does Sample A contain monosaccharides? [ Yes, because it went from blue to pink.]
Note: Disaccharides such as sucrose (table sugar) and lactose (milk sugar) are more
complex than monosaccharides. The Benedict test does not detect disaccharides directly.
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Activity A:
Identifying
nutrients
Get the Gizmo ready:
Click Reset.
Drag Sample A into the Food sample holder.
Introduction: Most food is composed of three types of molecules: carbohydrates, proteins,
and lipids.
Carbohydrates such as starches and sugars are major source of energy. Simple sugars
are found in sweets and fruits. Starches are found in potatoes, cereal, pasta, flour, and
other plant products.
Proteins are used in body structures such as muscles, skin, and hair. Rich sources of
proteins include meats, dairy products, and beans.
Lipids (fats and oils) are used for energy, insulation, and as an essential building block of
cells. Meats, dairy products, and oily plants s
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