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...where molecules become real TM Magnified 20 Million Times Color Key Indicates one monomer within a polymer NUCLEOTIDES Phosphorous Nucleotides are the building blocks of your DNA and RNA. There are four nucleotides in DNA, each composed of a base — adenine (A), thymine (T), guanine (G) or cytosine (C) — a deoxyribose sugar, and a phosphate group. In RNA, the deoxyribose is replaced by ribose, and the thymine base is replaced by uracil. In both DNA and RNA, enzymes called polymerases join the monomer nucleotides together to make long polymers. Cells use the unique sequence of nucleotides in DNA as a code to build the correct sequence of amino acids in a protein. Hydrogen Nitrogen Oxygen Carbon Deoxyadenosine Monophosphate T A NUCLEIC ACIDS Nucleic acids such as deoxyribonucleic acid (DNA) and ribonucleic acid (RNA) are composed of monomers known as nucleotides. DNA is a long, linear polymer of four different nucleotides — adenine, thymine, guanine and cytosine (A,T,G,C). The sequence of these four nucleotides in your DNA specifies the sequence of amino acids in your proteins. Two strands of DNA wrap around each other to form a right-handed double helix. This double helix contains complementary A-T and G-C base pairs. In 2001, researchers determined the exact nucleotide sequence of the 3.2 billion base pairs of the human genome. C G DNA viewed from the end showing the green monomer. Copyright 3D Molecular Designs - All Rights Reserved - 2009 - 2016 Version 5.0