Define the term epimerism, Biology

Define the Term Epimerism?

In addition to D and L isomerism sugars also exhibit epimerism. Hexoses that differ from each other as a result of variation of H and OH on carbons 2, 3 and 4 of glucose are known as epimers of glucose. Look at the structures of glucose and galactose below. Galactose is an epimer of glucose as it differs from glucose in the orientation of the H and OH groups on carbon number four.

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