Biochemical Tests for Macromolecules

The video tutorial covers an organic molecules lab where students learn to identify macromolecules in foods. The focus is on carbohydrates, lipids, and proteins, using tests like Benedict's, iodine, biuret, and Sudan. Known samples like egg whites, honey, and oil are tested, followed by unknown samples such as bread, avocado, turkey, and Doritos. The video concludes with instructions for data analysis and completing a lab report.

Which macromolecule is not considered in the lab due to its non-nutritional role in the body?

• Proteins

• Lipids

• Nucleic acids

• Carbohydrates

What does a color change in Benedict's test indicate?

• Presence of starches

• Presence of lipids

• Presence of proteins

• Presence of monosaccharides

Which test is used to detect the presence of starches?

• Sudan test

• Biuret test

• Iodine test

• Benedict's test

What color change in the Biuret test indicates the presence of proteins?

• Blue to orange

• Blue to purple

• Yellow to black

• Red to dark red

In the Sudan test, what does a change to a dark red color signify?

• Presence of nucleic acids

• Presence of proteins

• Presence of lipids

• Presence of carbohydrates

What was the result of the Benedict's test on egg whites?

• Change to yellow-orange

• No color change

• Change to purple

• Change to dark red

Which known sample showed a significant color change in the Sudan test?

• Egg whites

• Honey

• Oil

• Water

What was observed in the iodine test for bread?

• No color change

• Change to yellow-orange

• Change to dark black

• Change to purple

Which unknown sample showed a purple color in the Biuret test?

• Avocado

• Turkey

• Doritos

• Bread

What should students do after completing the lab tests?

• Discuss with peers

• Redo the tests

• Write a report

• Submit their data table