MDCAT Chemistry MCQ #4852

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?

MDCAT Chemistry MCQ #4852

  1. Question 1

    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?

    • A) Starch
    • B) Glycogen
    • C) Cellulose
    • D) Glucose

    Answer: Glycogen

    Explanation: Glycogen gives a red color with iodine; starch is a tempting distractor but yields a characteristic deep blue color.