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

Explanation:

1. Benedict's Test (blue): This test detects reducing sugars; a blue result means no reducing sugars are present.
2. Lugol's Iodine Test (pink): This test detects starch; a pink/brown result means no starch is present.
3. Biuret Test (blue): This test detects proteins; a blue result means no protein is present.
4. Sudan Red Test (pink/red): This test detects fats/lipids; a red result means fats/lipids are present.

Evaluating the options:

• Option 1 (beef, peanut butter, tuna): Contains protein (would turn Biuret purple), so incorrect.
• Option 2 (apple juice, honey, orange juice): Contains reducing sugars (would turn Benedict's orange/red), so incorrect.
• Option 3 (candy, table sugar, cake frosting): Contains only non-reducing sugars (sucrose), no starch, no protein, and cake frosting contains fat. This matches all test results.
• Option 4 (pasta, bread, crackers): Contains starch (would turn Lugol's black), so incorrect.

Answer:

candy, table sugar, cake frosting