Write a detailed note on biologically important sugar derivatives with suitable examples and draw their structures.

Biologically important sugar derivatives play essential roles in various biochemical processes, including metabolism, structural functions, and cellular communication. These sugar derivatives are modified forms of monosaccharides and include sugar acids, sugar alcohols, amino sugars, deoxy sugars, and glycosides. Each type has distinct biochemical significance and is involved in various physiological functions.  

### 1. Sugar Acids (Uronic Acids and Aldonic Acids)  
Sugar acids are oxidized forms of monosaccharides, where the aldehyde or hydroxyl group is converted into a carboxyl group.  

#### a) Uronic Acids  
Uronic acids are formed when the terminal hydroxyl (-CH₂OH) of a sugar is oxidized to a carboxyl (-COOH) group.  
- Example: Glucuronic Acid (C₆H₁₀O₇) – A component of glycosaminoglycans such as heparin and hyaluronic acid, involved ___ _____ ______ __________ ______ ________ _____ ____ ______ _______ ________ ______.
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