MDCAT Biology MCQ #978

Cotton fibers consist almost entirely of cellulose. Which structural mechanism contributes to the high tensile strength of these fibers?

MDCAT Biology MCQ #978

  1. Question 1

    Q1. Cotton fibers consist almost entirely of cellulose. Which structural mechanism contributes to the high tensile strength of these fibers?

    • A) Alpha 1-4 linkages creating a helical coil
    • B) Alpha 1-6 linkages creating frequent branches
    • C) Beta 1-6 linkages creating a globular shape
    • D) Beta 1-4 linkages creating straight unbranched chains

    Answer: Beta 1-4 linkages creating straight unbranched chains

    Explanation: Cellulose uses beta 1-4 linkages where every other glucose is inverted, allowing the formation of tough, straight microfibrils.