Testing Macromolecules

Monosaccharides (Glucose)

• What color is Benedict’s before testing?• What is it used to test the presence of?• glucose

Which tests are positive for glucose?Which sample shows the highest amount of glucose?

Which is a positive test for glucose?

• What do the various colors mean?

Iodine is what color at start?Which test tube below is a positive test?

Which is the control?

• Left is potato starch Right is distilled water

Which test positive for starch?

• Look for blue-black color

• Would you say the iodine and potato (left) is a positive or negative test?

• Would you say the iodine and onion (right) is a positive or negative test?

How do glucose molecules and starch molecules compare?

glucose

starch

Sucrose: glucose + fructose

Sudan IV turns fats redCan you tell where the fat and where the water is in this test

tube?

Sudan IV and Milk

What are some difficulties of testing beef broth? Why did we change to chicken broth?

Is this a positive or negative fat test?

• Before After drying

• Positive

Does milk have lipids?

• Added Sudan IV

Would this cat make a positive fat test?

What color is Biuret’s at start?How do you know if your sample is positive for protein?

PROTEIN TEST

• Table 5

Does milk have protein?

• Added Biuret’s

SUMMARY OF MACROMOLECULE LAB TESTS