Exploring Macromolecules

The video tutorial covers the importance of macromolecules in human physiology, focusing on carbohydrates, lipids, and proteins. It explains the different types of carbohydrates and their tests, such as Benedict's and Lugal's tests. The video also describes lipid testing methods, including the grease spot and Sudan 4 tests, and discusses the role of proteins and the Biuret test. The tutorial concludes with a summary of how these macromolecules function as building blocks and energy sources in living systems.

Which of the following is NOT one of the four major categories of macromolecules?

• Vitamins

• Carbohydrates

• Lipids

• Proteins

What is the primary function of carbohydrates in our diet?

• Chief source of energy

• Cell membrane function

• Insulation

• Energy storage

Tags

NGSS.HS-LS1-7

Which test is used to detect monosaccharides and disaccharides?

• Biuret's test

• Sudan 4 test

• Benedict's test

• Lugol's test

What color indicates a high concentration of sugar in the Benedict's test?

• Green

• Blue

• Yellow

• Red

What does a bluish-black color indicate in the Lugol's test?

• Presence of monosaccharides

• Presence of disaccharides

• Presence of polysaccharides

• Absence of carbohydrates

Which of the following is NOT a function of lipids in the body?

• Energy storage

• Enzyme activity

• Insulation

• Cell membrane function

What is the purpose of the uncoated paper test for lipids?

• To detect simple sugars

• To detect proteins

• To detect lipids

• To detect starch

What does a translucent spot on uncoated paper indicate?

• Presence of proteins

• Presence of lipids

• Presence of water

• Presence of carbohydrates

What color does Biuret's reagent turn in the presence of peptide bonds?

• Violet

• Red

• Green

• Blue

Which macromolecule is primarily responsible for structural components like hair and nails?

• Carbohydrates

• Proteins

• Nucleic acids

• Lipids