Question

analyze: look at the results for samples. which sample came from each person? how do you know?

worker in break room

lunch they were eating

what sample matches?

describe the evidence that supports your conclusion. |

jose	pasta
ashley	full - fat greek yogurt
bruce	water only
kiara	steak
tommy	fruit salad

Explanation:

To determine which sample matches each person, we analyze the lunch they ate:

• Jose (Pasta): Pasta is rich in carbohydrates (starch). A sample with starch (e.g., positive for iodine test, if applicable) would match.
• Ashley (Full - Fat Greek Yogurt): Yogurt has proteins and fats. A sample with protein (e.g., positive for biuret test) and fat (e.g., positive for Sudan IV test) would match.
• Bruce (Water only): A sample with no nutrients (no positive test for starch, protein, fat, sugar) would match, as water has no organic nutrients.
• Kiara (Steak): Steak is rich in protein (and fat). A sample with protein (biuret positive) and fat (Sudan IV positive) would match.
• Tommy (Fruit salad): Fruit has sugars (e.g., glucose, fructose) and may have starch. A sample with sugar (positive for Benedict's test) and/or starch (positive for iodine test) would match.

The key is to use biochemical tests (like iodine for starch, biuret for protein, Sudan IV for fat, Benedict's for sugar) to match the nutrient profile of the lunch to the sample. For example, if we have samples tested for these nutrients:

• A sample with starch (iodine turns blue - black) matches Jose's pasta.
• A sample with protein (biuret turns purple) and fat (Sudan IV stains red) matches Ashley's yogurt and Kiara's steak (but steak has more protein and fat, yogurt has protein and some fat).
• A sample with no positive tests (just water) matches Bruce.
• A sample with sugar (Benedict's turns orange - red) and maybe some starch (iodine blue - black) matches Tommy's fruit salad.

Answer:

• Jose: A sample with starch (e.g., iodine - positive). Evidence: Pasta is high in starch.
• Ashley: A sample with protein (biuret - positive) and fat (Sudan IV - positive). Evidence: Full - Fat Greek Yogurt has protein and fat.
• Bruce: A sample with no nutrient - positive tests. Evidence: He only ate water, which has no nutrients.
• Kiara: A sample with protein (biuret - positive) and fat (Sudan IV - positive). Evidence: Steak is high in protein and fat.
• Tommy: A sample with sugar (Benedict's - positive) and/or starch (iodine - positive). Evidence: Fruit salad has sugars (and some fruits have starch).