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Carboxyl
-CO=OH, acidic, polar, donates H+, and forms H bonds.
Carbonyl
-CO, neutral, polar.
Hydroxyl
-OH, acidic, polar, forms H bonds, increases solubility in water.
Amino
-NH2, basic, polar, accepts H+, forms H bonds.
Phosphate
-PO43-, acidic, polar, negatively charged, stores energy (ATP).
Sulfhydryl
-SH, acidic, polar, forms disulfide bonds, stabilizes proteins.
Methyl
-CH3, acidic, nonpolar.