Triops is a genus of small crustaceans in the order Notostraca (tadpole shrimp). Some species are considered living fossils, with a fossil record that reaches back to the late Carboniferous, 300 million years ago.
DNA structure. DNA is made up of molecules called nucleotides. Each nucleotide contains a phosphate group, a sugar group and a nitrogen base. The four types of nitrogen bases are adenine (A), thymine (T), guanine (G) and cytosine (C).The order of these bases is what determines DNA's instructions, or genetic code.NA is made up of molecules called nucleotides. Each nucleotide contains a phosphate group, a sugar group and a nitrogen base. The four types of nitrogen bases are adenine (A), thymine (T), guanine (G) and cytosine (C).
The DNA molecule is technically classified as a bipolymer, which means that it contains two polymer chains that link up to form the larger molecule. Each of these polymer chains is composed of a DNA monomer, or nucleotide, whose structure is formed from a phosphate group, a deoxyribose sugar and a nitrogen-containing base. The deoxyribose sugar forms part of the backbone of each DNA strand, which line up along the outside of the whole DNA molecule.