Why can humans digest plant Starch and Glycogen, but CANNOT digest plant Cellulose?
Answer and explanation
Correct answer: B. Humans lack cellulase to hydrolyze beta-1,4-glycosidic bonds
- Step 1: Starch and glycogen feature alpha-1,4 linkages hydrolyzed by salivary and pancreatic alpha-amylase. Step 2. Cellulose is composed of straight chains linked by beta-1,4-glycosidic bonds, which cannot be cleaved by human digestive enzymes lacking beta-glucosidase/cellulase. Answer: Humans lack the enzyme cellulase to hydrolyze beta-1,4-glycosidic bonds in cellulose. Why not the others: Cellulose is composed entirely of D-glucose; it is neutral, not acidic; spontaneous combustion is absurd.
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