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.
City of Gretna, NE Zip Codes. City of Gretna, NE Demographic Information. * Demographic data is based on information taken from the 2000 Census. City of Gretna, NE covers 1 Area Code. City of Gretna, NE covers 1 Zip Code. 16 Cities within 15 Miles of the City of Gretna, NE.