DNA and RNA Bases. In DNA, there are four different bases: adenine (A) and guanine (G) are the larger purines. Cytosine (C) and thymine (T) are the smaller pyrimidines.
Gretna is the second-largest city and parish seat of Jefferson Parish, Louisiana, United States. Gretna is on the west bank of the Mississippi River, just east and across the river from uptown New Orleans. It is part of the New Orleans â Metairie â Kenner Metropolitan Statistical Area. The population was 17,736 at the 2010 census.
Tattnall County, Georgia. Tattnall County is a county located in the southeast portion of the U.S. state of Georgia. As of the 2010 census, the population was 25,520. The county seat is Reidsville. The county was created on December 5, 1801 from part of Montgomery County, Georgia by the Georgia General Assembly.