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.
Fluvanna County, Virginia. For the community in Texas, see Fluvanna, Texas. Fluvanna County is a county located in the Piedmont region of the Commonwealth of Virginia. As of the 2010 census, the population was 25,691. Its county seat is Palmyra. Fluvanna County is part of the Charlottesville, Virginia Metropolitan Statistical Area.