10/23/2015

Late Nite Labs

Experiment­Specific Questions
Experiment 1: Monosaccharide Test
1. Fill in the table below with the results from the monosaccharide test experiment, and your conclusions based on those results. Results Monosaccharide Test
Solution

Initial Color

Color with Benedict's Solution

Color After Heating

Monosaccharide?

glucose solution

water

sucrose solution

fructose solution

2. Benedict’s solution is added to white grape juice and heated. The color changes from blue to orange. Based on this result, what biological molecules are present in the white grape juice? 3. Benedict’s solution can be used to distinguish between monosaccharides and disaccharides. Why? 4. Benedict’s solution cannot be used to distinguish between two monosaccharides. Why?

Experiment 2: Starch Test
1. Fill in the table below with the results from the starch test experiment.
Results Starch Test
Solution

Initial Color

Color with Iodine Solution

starch solution

water

2. Iodine solution is added to a chocolate chip cookie solution. The color changes to purple. Based on this result, what biological molecules are present in the chocolate chip cookie solution? 3. What is the relationship between monosaccharides and starches?

Experiment 3: Lipid Test
1. Fill in the table below with the results from the lipids test experiment.
Results Lipids Test
Solution

Initial Color

Color with Sudan Solution

corn Oil

water

2. What results would you expect from a sudan test of chicken soup? 3. What is the size difference between fat polymers and starch and protein polymers?

Experiment 4: Protein Test
1. Fill in the table below with the results from the protein and peptides test experiment..
Results Protein and Peptides Test
Solution

Initial Color

Color with Biuret Solution

egg albumin solution

water

2. What results would you expect from a biuret test of chicken soup?

Experiment 5: Food Contents Test https://labs.latenitelabs.com/api/assessment/shortAnswer/99299/52938 1/2

10/23/2015

Late Nite Labs

1. Fill in the table below with the results from the food experiment.
Results Food Test
Food

Reducing sugars

Starch

Lipids

Protein

potato juice

onion juice

whole milk

skim milk

2. Although we consider it non­fat, skim milk actually has very low levels of lipids. Therefore, it should test positive with Sudan solution. Why is the Sudan test for skim milk negative?

https://labs.latenitelabs.com/api/assessment/shortAnswer/99299/52938

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