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nmdcat.online June 27, 2026

The reason humans can digest starch but not cellulose is that human digestive enzymes can only hydrolyze

A. β-1,4 glycosidic bonds between glucose units
B. α-1,4 glycosidic bonds between glucose units
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C. Peptide bonds between amino acid monomers
D. Ester bonds in lipid polymers

📝 Explanation

Human amylases are specific for the α-1,4 glycosidic bonds found in starch and glycogen. Cellulose consists of glucose monomers linked by β-1,4 glycosidic bonds, which requires the enzyme cellulase, an enzyme humans do not produce.

📖 Additional Information

  • β-1,4 glycosidic bonds between glucose units
  • α-1,4 glycosidic bonds between glucose units
  • Peptide bonds between amino acid monomers
  • Ester bonds in lipid polymers

Human amylases are specific for the α-1,4 glycosidic bonds found in starch and glycogen. Cellulose consists of glucose monomers linked by β-1,4 glycosidic bonds, which requires the enzyme cellulase, an enzyme humans do not produce.

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