AQA - Required practical - Biology - Food Tests Quiz

Which reagent is used in the Benedict's test for reducing sugars?

• Iodine solution

• Biuret solution

• Ethanol

• Benedict's solution

What colour change indicates the presence of reducing sugars in the Benedict's test?

• Blue to green/yellow/orange/red

• Blue to purple

• Brown to blue-black

• Clear to cloudy white

Which reagent is used in the Biuret test for proteins?

• Iodine solution

• Biuret solution

• Ethanol

• Benedict's solution

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

• Blue to green/yellow/orange/red

• Blue to purple

• Brown to blue-black

• Clear to cloudy white

Which reagent is used in the Iodine test for starch?

• Iodine solution

• Biuret solution

• Ethanol

• Benedict's solution

What colour change indicates the presence of starch in the Iodine test?

• Blue to green/yellow/orange/red

• Blue to purple

• Brown to blue-black

• Clear to cloudy white

Which reagent is used in the Emulsion test for lipids?

• Iodine solution

• Biuret solution

• Ethanol

• Benedict's solution

What indicates the presence of lipids in the Emulsion test?

• Blue to green/yellow/orange/red

• Blue to purple

• Brown to blue-black

• Clear to cloudy white

In the Benedict's test, what must be done to the solution after adding Benedict's reagent?

• Heat it in a water bath

• Leave it at room temperature

• Cool it in an ice bath

• Shake it vigorously

What is the first step in the Biuret test for proteins?

• Add iodine solution

• Add Biuret solution

• Add ethanol

• Add Benedict's solution