MDCAT Biology MCQ #705

Humans can digest starch but not cellulose. This is because the human digestive system lacks enzymes to break which specific type of bond?

MDCAT Biology MCQ #705

  1. Question 1

    Q1. Humans can digest starch but not cellulose. This is because the human digestive system lacks enzymes to break which specific type of bond?

    • A) Alpha-1,4-glycosidic bonds
    • B) Alpha-1,6-glycosidic bonds
    • C) Beta-1,4-glycosidic bonds
    • D) Peptide bonds

    Answer: Beta-1,4-glycosidic bonds

    Explanation: Cellulose contains beta-1,4-glycosidic linkages which humans cannot digest. Amylose is tempting because it is also a glucose polymer, but it has alpha-linkages.