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.
Officials say work has started on the upcoming demolition of the Indianapolis International Airport's old passenger terminal. Airport officials said Thursday that the current work involves waste removal and exterior preparation that's needed before substantial demolition of the terminal can begin. The terminal's four concourses and other structures built between 1954 and 1987 are all expected to be cleared by year's end. Indianapolis Airport Authority director Robert Duncan says the demolition will make the site along Interstate 465 more marketable to developers.