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.
Sponsored Topics. Smyrna is a city in Cobb County, Georgia, United States. As of the 2010 census, the city had a population of 51,271. It is included in the Atlanta-Sandy Springs-Marietta, GA MSA, which is included in the Atlanta-Sandy Springs-Gainesville, GA-AL CSA. Pioneers began settling the area in 1832.