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 Squirrels: Squirrels are often a pest in Indianapolis. They love to live in an attic, and will chew on wood or electrical wires. They are agile creatures, and live throughout the state of Indiana. Call Indy Wildlife Services if you need squirrel removal in Indianapolis. Indianapolis Opossum: You may spot this animal in Indianapolis at night time, perhaps rooting through your garbage.