Biological Molecules and Their Detection Tests Quiz

Which test is used to identify the presence of starch, or complex carbohydrates, in a food sample?

• Benedict's test

• Iodine test

• Ethanol/emulsion test

• Biuret test

What reagent is used in the test for testing for simple sugars?

• Benedict's solution

• Ethanol

• Biuret solution

• Iodine solution

Which biological molecule is detected using the Biuret test?

• Carbohydrates

• Lipids

• Proteins

• Nucleic acids

What color does a positive test with Biuret reagent turn?

• Blue / Purple

• Red / Orange

• Green

• White

What color does a positive test with Benedicts reagent turn?

• Blue / Purple

• Red / Orange

• Green

• White

What is the purpose of adding drops of a food sample to a paper towel?

• To test for proteins

• To test for lipids

• To test for starch

• To test for sugars

What happens to the paper towel if lipids are present in the food sample?

• It becomes opaque, you can't see anything through it

• It becomes transparent, you can see some everything through it

• It becomes translucent, you can see some light through it

• It becomes invisible

Which of the following is a monomer of proteins?

• Glycerol

• Amino acids

• Glucose

• Fatty acids

What type of biological molecule is starch?

• Nucleic acid

• Lipid

• Protein

• Carbohydrate

Which food sample showed a positive result for protein?

• Water

• Oil

• Apple Juice

• Milk