A lab analyst adds a drop of iodine solution to an unknown carbohydrate sample, resulting in a deep red color. Which substance is likely present?
Q1. A lab analyst adds a drop of iodine solution to an unknown carbohydrate sample, resulting in a deep red color. Which substance is likely present?
Answer: Glycogen
Explanation: Glycogen gives a red color with iodine; starch is a tempting distractor but yields a characteristic deep blue color.