Biomolecule Test Recovery Quiz

Which reagent is commonly used to test for the presence of starch in a sample?

• Benedict’s solution

• Iodine solution

• Biuret reagent

• Sudan III stain

What color change indicates a positive result for the presence of glucose when using Benedict’s solution?

• Blue to green/yellow/orange/red

• Blue to purple

• Brown to blue-black

• Red to colorless

Which biomolecule is detected using the Biuret test?

• Carbohydrates

• Proteins

• Lipids

• Nucleic acids

A student adds Sudan III stain to a food sample. What is the test for?

• Proteins

• Lipids

• Starch

• Glucose

What is the expected color change when iodine solution reacts with starch?

• Blue to green

• Brown to blue-black

• Red to yellow

• Purple to pink

Which of the following equations represents the general formula for a monosaccharide?

Which test would you use to confirm the presence of proteins in a food sample?

• Benedict’s test

• Biuret test

• Iodine test

• Sudan III test

What is the main color change observed in a positive Biuret test for proteins?

• Blue to green

• Blue to purple/violet

• Brown to blue-black

• Red to orange

Which of the following is NOT a biomolecule?

• Protein

• Lipid

• Water

• Carbohydrate

What is the main function of enzymes in biomolecule tests?

• To provide color

• To speed up chemical reactions

• To act as indicators

• To dissolve the sample