Macromolecules Quiz

What are the four types of macromolecules discussed in the lab? Which one is not tested in this experiment, and why?

• Carbohydrates, Lipids, Proteins, Nucleic Acids; Nucleic Acids because they are not used as nutrients  

• Carbohydrates, Lipids, Proteins, Vitamins; Vitamins because they are not nutrients  

• Carbohydrates, Proteins, Minerals, Lipids; Minerals because they are not organic molecules  

• Carbohydrates, Lipids, Proteins, Fats; Fats because they are not necessary  

How is Benedict’s solution used to test for the presence of simple sugars? What color change would indicate a positive result?

• It turns from blue to purple when simple sugars are present  

• It turns from blue to green when lipids are present  

• It turns from blue to orange/yellow when simple sugars are present

• It turns from yellow to blue when proteins are present  

What does a positive iodine test indicate, and what color change confirms it?

• Presence of lipids; blue to green  

• Presence of starches; yellow-brown to purple-black  

• Presence of proteins; blue to purple  

• Presence of simple sugars; blue to orange  

Which color change in the Biuret test confirms the presence of proteins?

• Blue to green

• Blue to yellow

• Blue to purple

• Blue to red

What color change in the Sudan test indicates the presence of lipids?

• Blue to purple

• Light pink to dark red

• Yellow to orange

• Brown to black

Why is water used as a control group in the experiment?

• Because water contains all macromolecules  

• To compare the results, since water should show no color change  

• To enhance the visibility of the color changes  

• Water helps detect the presence of nucleic acids

In the egg white experiment, which macromolecules were detected?

• Carbohydrates and lipids

• Proteins and lipids

• Starch and monosaccharides

• Proteins and starch

Why did honey show a positive Benedict’s test but no significant change in the iodine or Biuret tests?

• Honey contains starch and lipids  

• Honey contains simple sugars but no starch or protein  

• Honey contains proteins and lipids  

• Honey contains complex carbohydrates but no proteins  

Why did oil only show a positive result in the Sudan test?

• Oil contains proteins but no carbohydrates  

• Oil contains starch but no sugars  

• Oil contains lipids but no carbohydrates or proteins  

• Oil contains simple sugars but no starch  

Why did both the Benedict’s and Iodine tests show positive results for the bread sample?

• The bread contains proteins and lipids  

• The bread contains simple carbohydrates and proteins  

• The bread contains simple and complex carbohydrates  

• The bread contains only lipids