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).
If a sequence of bases on one strand of DNA is CTGCTA, then the other DNA strand will be GACGAT. The Structure of DNA, RNA, and DNA's Arrangement in Cells DNA is Composed of Four Types of Nucleotides Since the 1920's, scientists have known that the DNA molecule is a very long polymer, or string of repeating units. The small units, or monomers that make up DNA are called nucleotides. Nucleotides Each nucleotide in DNA consists of three parts.