Osphena Â® should not be used if you have unusual vaginal bleeding, have or have had certain types of cancers (including cancer of the breast or uterus), have or have had blood clots, have had a stroke or heart attack, have severe liver problems, are allergic to Osphena Â® or any of its ingredients, or think you may be pregnant.
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).
1 Functions of DNA and summary of structure DNA consists of four basesâA, G, C, and Tâthat are held in linear array by phosphodiester bonds through the 3' and 5' positions of adjacent deoxyribose moieties.2  DNA is organized into two strands by the pairing of bases A to T and G to C on complementary strands. Functions of DNA and summary of structure DNA consists of four basesâA, G, C, and Tâthat are held in linear array by phosphodiester bonds through the 3' and 5' positions of adjacent deoxyribose moieties.