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Unformatted text preview: strongly with polar water molecules. Hydroxyl group is polar because of the presence of a strongly electronegative oxygen atom. Carbonyl group ‘s double bond is polar because of the electronegativity of the oxygen; thus, it is hydrophilic. Carboxyl group’s polar because of the two oxygen atoms are so close to together. This causes the hydrogen atom to be stripped of its electron and be releases as a hydrogen atom. Thus, the ionized carboxyl group has 1 unit of a negative charge. They are weakly acidic. They exist as one of two hydrophilic states: ionic or polar. Amino groups are weakly basic because they are able to accept a hydrogen ion. The resultng ionized amino group has 1 unit of positic charge. Phosphate group is weakly acidic because it can release two hydrogen atoms. Sulfhydryl group is found in molecules called thiols. They can make important contributions to the structure of proteins....
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- Fall '09
- Atom, Chemical bond, carboxyl group, double bond