Testing for Biological Macromolecules

The video tutorial covers various food tests to identify nutrition types in food. It explains how to test for starch using iodine solution, lipids using filter paper and ethanol, protein using Biuret solution, and sugars using Benedict's solution. Each test is demonstrated with examples like potatoes for starch, butter for lipids, milk for protein, and glucose for sugars. The video also highlights the color changes that indicate the presence of these nutrients.

Which nutrient is tested using iodine solution?

• Lipids

• Sugars

• Proteins

• Starch

What color indicates the presence of starch when iodine solution is used?

• Green

• Yellow

• Blue-black

• Red

Which method can be used to test for lipids using filter paper?

• Dipping the paper in water

• Heating the paper

• Adding iodine solution

• Rubbing butter on the paper

What appearance does the filter paper take if lipids are present?

• Transparent

• Colored

• Translucent

• Opaque

What chemical is used alongside ethanol to test for lipids?

• Iodine

• Water

• Benedict's solution

• None

Which solution is used to test for proteins?

• Ethanol

• Biuret solution

• Iodine solution

• Benedict's solution

What color change indicates the presence of protein with Biuret solution?

• Orange to brown

• Blue to red

• Purple or lilac

• Green to yellow

Which solution is used to test for sugars?

• Biuret solution

• Iodine solution

• Benedict's solution

• Ethanol

What is the final color change indicating the presence of sugars with Benedict's solution?

• Purple to lilac

• Orange to brick red

• Yellow to orange

• Blue to green

What is required for the sugar test using Benedict's solution?

• Filtering

• Cooling

• Heating

• Shaking