Polar Amino Acids An amino acid is polar when the R group is an alcohol, thiol, or amide. 11. Acidic Amino Acids An amino acid is acidic when the R group is a carboxylic acid. 12. Basic Amino Acids An amino acid is basic when the R group is an amine.
Friedensburg is a census-designated place (CDP) in Schuylkill County, Pennsylvania, United States. The population was 828 at the 2000 census.
Nether Providence Township is a first class township in Delaware County, Pennsylvania, United States. Many residents refer to the township by the name of its largest community, Wallingford, because the Wallingford postal code is used for most of the township.