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Gizmos
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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 you can get from food? Carbohydrates
pRoteins Fats vitamins minerals
2. How are these nutrients used by your body? provide energy contribute
to body structure and/or regulate Chemical processes
in the body
Gizmo Warm-up
Food samples
Food sample
Have you ever wondered what is in your food? Scientists
R
holder
Sample K
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. What is done in the Benedict test?
Carbohydrate test
mixing the SAMPle with Benedicts
Light
Reagent and heating it if reducing
Change color and more
Test
Test
2. The Benedict solution is a test for monosaccharides; simple sugars like glucose or fructose
(fruit sugar); and some disaccharides such as lactose and maltose. In contact with these
sugars, the Benedict solution turns from blue to green to orange. For simplicity, we will
consider the Benedict test a test for monosaccharides only.
Does Sample A contain these sugars? yes
Note: Sucrose (table sugar) is a disaccharide that is not detected by the Benedict test.
Foods sweetened only with table sugar will show a negative Benedict test.
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