MDCAT Biology MCQ #954

An entomologist studies the exoskeleton of a beetle while a botanist studies wood. What chemical element distinguishes chitin from cellulose?

MDCAT Biology MCQ #954

  1. Question 1

    Q1. An entomologist studies the exoskeleton of a beetle while a botanist studies wood. What chemical element distinguishes chitin from cellulose?

    • A) Presence of alpha-1,4-glycosidic linkages
    • B) Presence of nitrogen in its glucose derivatives
    • C) Ability to turn blue with iodine solution
    • D) Solubility in organic solvents like alcohol

    Answer: Presence of nitrogen in its glucose derivatives

    Explanation: Chitin is a polymer of N-acetylglucosamine, containing nitrogen. Cellulose is a pure glucose polymer without nitrogen.