Indicators and Macromolecules Name: _______________________________ Per: ___ #

Purpose: To investigate the role of indicators in identifying macromolecules.

Directions: For each of the following demonstrations, make a prediction, write your observations, and generalize the

results.

TEST 1:

Indicator: ______________________________ Macromolecule: ______________________________

Procedure: 1.

2.

3.

Substance Predict Observe Generalize

Saltine cracker In the presence of ________________,

the sample appears

__________________ when tested

using the __________________ test.

In the absence of ________________,

the sample appears when tested using

the __________________ test.

Chewed saltine cracker

Corn starch

Water

TEST 2:

Indicator: ______________________________ Macromolecule: ______________________________

Procedure: 1.

2.

3.

Substance Predict Observe Generalize

Egg white

In the presence of ________________,

the sample appears

__________________ when tested

using the __________________ test.

In the absence of ________________,

the sample appears when tested using

the __________________ test.

Egg yolk

Water

TEST 3

Indicator: ______________________________ Macromolecule: ______________________________

Procedure: 1.

2.

3.

Substance Predict Observe Generalize

Vegetable oil

In the presence of ________________,

the sample appears

__________________ when tested

using the __________________ test.

In the absence of ________________,

the sample appears when tested using

the __________________ test.

Water

SUMMARIZE

Directions: Use your observations and generalizations to complete the table below and summarize the possible results

of each indicator test by completing the table below.

Macromolecule Indicator Test POSITIVE TEST RESULTS NEGATIVE TEST RESULTS

Carbohydrates

Proteins

Lipids