Question

1. which foods would have the following nutrient test results?

beef, peanut butter, tuna
apple juice, honey, orange juice
candy, table sugar, cake frosting
pasta, bread, crackers

1. which of the following would test positive in the biuret test, and negative in the sudan red

Explanation:

• Benedict's test: Used to detect reducing sugars. A positive result (orange - red color change) indicates the presence of reducing sugars. Apple juice, honey, and orange juice contain reducing sugars.
• Lugol's test: Used to detect starch. A positive result (blue - black color change) is not relevant here as the Lugol's test in the image does not show a positive result for the correct option.
• Biuret test: Used to detect proteins. A negative result (no color change to violet) for the correct option (apple juice, honey, orange juice) is appropriate as these are mainly sources of sugars, not proteins.
• Sudan Red test: Used to detect lipids. A positive result (red - color change) is not for the correct option. Apple juice, honey, and orange juice are not high - lipid foods.

Answer:

apple juice, honey, orange juice