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Lab 3 Identification of Carbohydrates, Proteins, and Lipids Assignment

 

Results

 

1. While looking at the pictures for the results of each test, fill in the chart below (+/- means was the color positive or negative):

 

No.

 

 Substance Benedict Test Iodine Test Biuret Test Sudan Dye
    color +/- color +/- color +/- +/-
1 water (control)              
2 10 % glucose              
3 10 % sucrose              
4 10 % starch              
5 10 % albumin              
6 salad oil              
7 milk              
8 regular soda              
9 unknown              

 

 

 

2. Fill in the table below for the results of the Benedict Test (look at the color for each test tube and then match up the color in the table found on page 7):

 

No. Substance Gm %
1 water (control)  
2 10 % glucose  
3 10 % sucrose  
4 10 % starch  
5 10 % albumin  
6 salad oil  
7 milk  
8 regular soda  
9 unknown  

 

 

Answer questions with complete sentences.

 

3. A clear regular (non-diet) soda was tested. How much reducing sugar was present in the sample? Is the reason it is sweet because it contains reducing sugars? How do you know this?

 

 

4. Did the milk you tested contain protein? How do you know this? If it contained protein can you determine how much? Why or why not?

 

 

 

5. Do you think the Sudan Dye Test is a quantitative or qualitative test? Why or why not?

 

 

6. What is an indicator substance? Give an example.

 

 

7. Which tests gave you a positive result when you tested your unknown? What does this tell you?

 

 

8. Outline the functions of the polysaccharides in the table below.

 

Polysaccharide Function
Glycogen  
Chitin  
Cellulose  
Starch  

 

 

9. Outline the functions of the proteins in the table below:

 

Protein Function
Hemoglobin  
Keratin  
Myoglobin  
Fibrin  
Serum albumin  
Insulin  
Calmodulin  
Immunoglobins  
Cytochromes  
Vasopressin  
Pepsin  
Ferritin  

 

 

 

10. Outline the functions of the lipids in the table below:

 

Lipid Function
Lecithin  
Prostaglandins  
Cholesterol  
Estrogen  
Carotene  

 

 

11. Which groups of organic molecules would you expect to find in the following:

 

a. corn oil –

 

b. silk –

 

c. rubber –

 

d. soap –

 

e. molasses –

Lab 3

I

dentification of

C

arbohydrates

, P

roteins

,

and

L

ipids

 

Assignment

Results

  1.  While looking at thepictures for theresults of each test, fill in the chart below

(+/-meanswas the color positive or negative):No.Substance

Benedict Test

Iodine Test

Biuret Test

Sudan Dye color+/color+/-color+/-+/

 

water (control)

 

2. 10%  glucose

 

3. 10 % sucrose

 

4. 10 % starch

 

5. 10 % albumin

 

6. salad oil

 

 

7. milk

 

8. regular soda

 

9. unknown

 

2. Fill in the table below for the results of the Benedict Test (look at the color for each test tube and then match up the color in the table found on page 7):

 

 

 

No.Substance Gm %

 

1

 

water (control)

 

2

10 % glucose

3

10 % sucrose

4

10 % starch

 

5

10 % albumin

 

6

salad oil

7

milk

8

regular soda

9

unknown

Answer questions with complete sentences.

3.

A clear regular (non diet) soda was tested

. How much reducing sugar was present in the sample? Is the reason it is sweet because it contains reducing sugars? How do you know this?

 

Lab 3 Identification of Carbohydrates, Proteins, and Lipids Assignment

 

Results

 

1. While looking at the pictures for the results of each test, fill in the chart below (+/- means

was the color positive or negative):

 

No.

 

Substance

Benedict

Test

Iodine Test Biuret

Test

Sudan

Dye

color +/- color +/- color +/- +/-

1 water (control)

2 10 % glucose

3 10 % sucrose

4 10 % starch

5 10 % albumin

6 salad oil

7 milk

8 regular soda

9 unknown

 

 

2. Fill in the table below for the results of the Benedict Test (look at the color for each test tube

and then match up the color in the table found on page 7):

 

No. Substance Gm %

1 water (control)

2 10 % glucose

3 10 % sucrose

4 10 % starch

5 10 % albumin

6 salad oil

7 milk

8 regular soda

9 unknown

 

 

Answer questions with complete sentences.

 

3. A clear regular (non-diet) soda was tested. How much reducing sugar was present in the

sample? Is the reason it is sweet because it contains reducing sugars? How do you know

this?

 
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