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BIO NMDCAT Carbohydrates
nmdcat.online June 27, 2026

The primary structural difference between starch (amylopectin) and glycogen is the frequency of branching. Glycogen’s branches are approximately 8-12 glucose units apart, whereas amylopectin’s branches are 24-30 units apart. This difference directly contributes to glycogen’s

A. Lower solubility in cold water
B. Greater osmotic pressure per unit mass for a given number of reducing ends
C. More rapid degradation and release of glucose monomers
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D. Higher molecular weight and density

📝 Explanation

The higher density of non-reducing ends in glycogen allows more glycogen phosphorylase molecules to work simultaneously on a single molecule, dramatically increasing the rate of glucose-1-phosphate release during sudden demands for energy.

📖 Additional Information

  • Lower solubility in cold water
  • Greater osmotic pressure per unit mass for a given number of reducing ends
  • More rapid degradation and release of glucose monomers
  • Higher molecular weight and density

The higher density of non-reducing ends in glycogen allows more glycogen phosphorylase molecules to work simultaneously on a single molecule, dramatically increasing the rate of glucose-1-phosphate release during sudden demands for energy.

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