A-Level Biology Biochemical Tests Quiz

What is the reagent used to test for the presence of starch?

• Benedict's solution

• Iodine

• Biuret solution

• Ethanol

What color change indicates a positive result for the presence of starch?

• Blue to green

• Orange to blue-black

• Red to yellow

• Purple to pink

Which reagent is used to test for reducing sugars?

• Biuret solution

• Ethanol

• Iodine

• Benedict's solution

What is the initial color of Benedict's solution?

• Yellow

• Green

• Red

• Blue

What is the first step in testing for non-reducing sugars?

• Add ethanol

• Perform Benedict's test

• Add Biuret solution

• Add iodine

What is the purpose of boiling the sample with acid in the non-reducing sugar test?

• To hydrolyze glycosidic bonds

• To dissolve the sample

• To neutralize the sample

• To change the color

Which reagent is used to test for proteins?

• Ethanol

• Iodine

• Biuret solution

• Benedict's solution

What color indicates a positive result for the presence of proteins?

• Red

• Purple

• Blue

• Green

What is the first step in testing for lipids?

• Add ethanol

• Add Biuret solution

• Add Benedict's solution

• Add iodine

What indicates a positive result in the lipid test?

• Green color

• Blue color

• White emulsion

• Red precipitate