Concept 19 The DNA molecule is shaped like a twisted ladder. Earlier work had shown that DNA is composed of building blocks called nucleotides consisting of a deoxyribose sugar, a phosphate group, and one of four nitrogen bases â adenine (A), thymine (T), guanine (G), and cytosine (C).-ray crystallography provided the final clue that the DNA molecule is a double helix, shaped like a twisted ladder. In 1953, the race to determine how these pieces fit together in a three-dimensional structure was won by James Watson and Francis Crick at the Cavendish Laboratory in Cambridge, England.
The Indianapolis International Airport is located off I-70 via exit 68, just five minutes west of I-465. 7800 Col. H. Weir Cook Memorial Drive. Indianapolis, IN 46241.
Indianapolis Public Schools is located in Marion County, Ind. Indianapolis Public Schools is located in central Indiana in Marion County. The county seat is Indianapolis. Marion County was home to 939,020 residents between 2010 and 2015, according to the United States Census Bureau. Marion County outperformed Indiana as a whole in terms of higher education attainment between 2010 and 2014.