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BIO NMDCAT Carbohydrates
nmdcat.online June 27, 2026

The glycosidic linkage in trehalose, a disaccharide found in insect hemolymph, is an α,α-1,1 linkage between two glucose units. This makes trehalose a non-reducing sugar, a property that is vital for

A. Allowing it to be easily transported across the gut wall without being metabolized during transit
B. Preventing it from reacting with the amino groups of proteins and peptides in the hemolymph
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C. Enabling it to be a structural component of the insect exoskeleton
D. Allowing it to function as a signaling molecule in neuronal synapses

📝 Explanation

A non-reducing sugar lacks a free carbonyl group, so it cannot participate in non-enzymatic glycation (Maillard reaction) with amino groups. This stability is crucial in the hemolymph, where high concentrations of trehalose could otherwise react with and damage circulating proteins.

📖 Additional Information

  • Allowing it to be easily transported across the gut wall without being metabolized during transit
  • Preventing it from reacting with the amino groups of proteins and peptides in the hemolymph
  • Enabling it to be a structural component of the insect exoskeleton
  • Allowing it to function as a signaling molecule in neuronal synapses

A non-reducing sugar lacks a free carbonyl group, so it cannot participate in non-enzymatic glycation (Maillard reaction) with amino groups. This stability is crucial in the hemolymph, where high concentrations of trehalose could otherwise react with and damage circulating proteins.

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