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.
Buffalo County. 1  Morning train in Ravenna. The Burlington Hotel on the right was 110-foot frame structure built in 1891, with its own power plant to light the building and grounds. 2  The sod home on Echo Farm, northeast of Ravenna. 3  An early view of Ravenna, with an obvious absence of trees.