Testing Food Groups and Reagents

What are amino acids?

• Large molecules that form carbohydrates

• Small molecules that join together to form proteins

• Molecules that make up part of fats

• A type of reagent used in tests

What is the main source of energy in the diet?

• Proteins

• Lipids

• Carbohydrates

• Amino acids

What is glycerol a part of?

• Proteins

• Carbohydrates

• Lipids

• Amino acids

What are proteins made up of?

• Sugars

• Amino acids

• Glycerol

• Starch

What is a reagent used for?

• To eat

• To test for the presence of a particular substance

• To build proteins

• To store energy

Which solution is used to test for reducing sugars?

• Iodine solution

• Biuret solution

• Ethanol

• Benedict’s solution

What colour change indicates the presence of reducing sugars when using Benedict’s solution?

• Yellow to green

• Blue to purple

• Blue to green to orange to brick red

• Brown to blue/black

What is the result of a positive test for starch using iodine solution?

• Blue to purple

• Yellow/brown to blue/black

• Blue to brick red

• Clear to cloudy

Which solution is used to test for proteins?

• Benedict’s solution

• Iodine solution

• Biuret solution

• Ethanol

What colour change indicates the presence of proteins when using Biuret solution?

• Blue to purple

• Yellow to green

• Blue to brick red

• Yellow/brown to blue/black