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.
Natrona Heights is an unincorporated community in Harrison Township, Allegheny County in the U.S. state of Pennsylvania; it is located in Western Pennsylvania within the Pittsburgh Metropolitan Statistical Area, approximately 24 miles (39 km) northeast of Pittsburgh.he film Knightriders (1981) by George A. Romero starring Ed Harris used scenes shot on Pennsylvania Avenue and in a restaurant on Freeport Road in Natrona Heights, as well as several scenes in neighboring Natrona for the movie.