PLTW Principles of Biomedical
Science: 2.2 Review Questions and
Answers 100% Pass
glucose, starch, protein, and lipids - ✔✔what are the main nutrients found in food? (4)
benedict's solution and lugol's iodine - ✔✔how can carbohydrates be detected in foods?
(2)
brown paper bag - ✔✔how can lipids be detected in foods?
bieuret's indicator - ✔✔how can proteins be detected in foods?
glucose/simple sugars - ✔✔what does benedict's solution detect? (2)
aquamarine - ✔✔what does a negative reaction to benedict's solution look like?
orange - ✔✔what does a positive reaction to benedict's soluteion look like?
starch - ✔✔what does lugol's iodine detect?
amber brown - ✔✔what does a negative reaction to lugol's iodine look like?
black/purple - ✔✔what does a positive reaction to lugol's iodine look like?
Brittie Donald, All Rights Reserved © 2025 1
, protein - ✔✔what does bieurets indicator detect?
dark blue - ✔✔what does a negative reaction to bieurets indicator look like?
purple - ✔✔what does a positive reaction to bieurets indicator look like?
lipids - ✔✔what do brown paper bags indicate?
doesn't tint paper - ✔✔what does a negative reaction to the brown paper bag test look
like?
transluscent - ✔✔what does a positive reaction to the brown paper bag test look like?
healthy: fruits unhealthy: cookies, sweets, etc - ✔✔what types of foods supply sugar?
(3ish)
potatoes, pasta, breads, oatmeal, any other complex carbohydrate - ✔✔what types of
foods supply starch? (5)
meat, dairy, legumes (beans, nuts) - ✔✔what types of foods supply proteins? (3)
oils, butter, meat - ✔✔what types of foods supply lipids? (3)
food labels can be used to evaluate the amount of nutrients and unhealthy molecules
you consume in one day - ✔✔how can food labels be used to evaluate dietary choices?
Brittie Donald, All Rights Reserved © 2025 2
Science: 2.2 Review Questions and
Answers 100% Pass
glucose, starch, protein, and lipids - ✔✔what are the main nutrients found in food? (4)
benedict's solution and lugol's iodine - ✔✔how can carbohydrates be detected in foods?
(2)
brown paper bag - ✔✔how can lipids be detected in foods?
bieuret's indicator - ✔✔how can proteins be detected in foods?
glucose/simple sugars - ✔✔what does benedict's solution detect? (2)
aquamarine - ✔✔what does a negative reaction to benedict's solution look like?
orange - ✔✔what does a positive reaction to benedict's soluteion look like?
starch - ✔✔what does lugol's iodine detect?
amber brown - ✔✔what does a negative reaction to lugol's iodine look like?
black/purple - ✔✔what does a positive reaction to lugol's iodine look like?
Brittie Donald, All Rights Reserved © 2025 1
, protein - ✔✔what does bieurets indicator detect?
dark blue - ✔✔what does a negative reaction to bieurets indicator look like?
purple - ✔✔what does a positive reaction to bieurets indicator look like?
lipids - ✔✔what do brown paper bags indicate?
doesn't tint paper - ✔✔what does a negative reaction to the brown paper bag test look
like?
transluscent - ✔✔what does a positive reaction to the brown paper bag test look like?
healthy: fruits unhealthy: cookies, sweets, etc - ✔✔what types of foods supply sugar?
(3ish)
potatoes, pasta, breads, oatmeal, any other complex carbohydrate - ✔✔what types of
foods supply starch? (5)
meat, dairy, legumes (beans, nuts) - ✔✔what types of foods supply proteins? (3)
oils, butter, meat - ✔✔what types of foods supply lipids? (3)
food labels can be used to evaluate the amount of nutrients and unhealthy molecules
you consume in one day - ✔✔how can food labels be used to evaluate dietary choices?
Brittie Donald, All Rights Reserved © 2025 2
