Answer to Question #125268 in Biochemistry for Arpan Das

Question #125268
In aqueous solution, almost all D-glucose molecules are in the pyranose form. Other aldoses have a greater proportion of molecules in the open-chain form. D-Glucose may have evolved to be the predominant hexose because it is less likely than its isomers to react with and damage cellular proteins. Explain why D-glucose reacts less than other aldoses with the amino groups of proteins.
Expert's answer

Only aldoses are present are in open chain conformation as they have free aldehyde and are able to form Schiff bases with amino group of proteins. As most of the D-glucose molecules in solution are closed-chain and only a few are in open-chain form. D-glucose has less probability than other aldoses to react with amino groups.

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