Food Tests in Biology

What is the first step in preparing a food sample for testing?

• Filter the solution

• Break up the food using a mortar and pestle

• Add Benedict's solution

• Add iodine solution

What is the final step in preparing a food sample for testing?

• Add iodine solution

• Shake the solution

• Filter the solution

• Add Benedict's solution

In the Benedict's test, what does a brick red color indicate?

• Absence of lipids

• Presence of proteins

• High concentration of reducing sugars

• Presence of starch

What is the purpose of using a water bath in the Benedict's test?

• To filter the solution

• To dissolve the food sample

• To cool the solution

• To heat the solution to 75°C

What is the expected outcome if no reducing sugars are present in the Benedict's test?

• Solution turns blue-black

• Solution remains blue

• Solution turns pink

• Solution turns cloudy white

Which test is used to identify the presence of proteins in a food sample?

• Benedict's test

• Iodine test

• Biuret test

• Sudan III test

What color change indicates the presence of starch when using the iodine test?

• Red to green

• Brown to blue-black

• Yellow to brick red

• Blue to pink

What additional step is required in the Biuret test for Edexcel students?

• Add ethanol

• Add Sudan III solution

• Add potassium hydroxide and copper sulfate

• Add distilled water

Which solution is added to a food sample to test for lipids using the Sudan III test?

• Benedict's solution

• Biuret solution

• Iodine solution

• Sudan III stained solution

What indicates the presence of lipids in the Emulsion test?

• Solution remains clear

• Solution becomes cloudy white

• Solution turns pink

• Solution turns blue