These nitrogenous bases hydrogen bond between opposing DNA strands to form the rungs of the twisted ladder or double helix of DNA or a biological catalyst that is found in the nucleotides.
That is, A (adenine) can only form hydrogen bonds with T (thymine) and C (cytosine) can only form bonds with G (guanine). This means, that if you know the sequence of bases of one strand, you know the sequence of bases of the other strand. The strands is such a molecule are said to be complementary. These strong covalent bonds form the the glue that holds the sugar/phosphate backbone together and thus act to keep each strand together. The two strands of DNA are held together by weak hydrogen bonds (remember, something must hold them together!) between the nitrogenous bases. The interesting (and very important) aspect of the Watson-Crick model is that these hydrogen bonds are base specific Nucleotides. A nucleotide consists of three things: The nitrogen bases are pyrimidine in structure and form a bond between their 1' nitrogen and the 1' -OH group of the deoxyribose. This type of bond is called a glycosidic bond. The phosphate group forms a bond with the deoxyribose sugar through an ester bond between one of its negatively charged oxygen groups and the 5' -OH of the sugar 1  (). A nitrogenous base, which can be either adenine, guanine, cytosine, or thymine (in the case of RNA, thymine is replaced by uracil). Overview [edit]. A DNA nucleotide is composed of 3 main units: a sugar, a phosphate group, and a nitrogenous base. While the sugar and phosphate group alternate in sequence and form the backbone of the DNA double helix, the nitrogenous bases may differ in every adjoining nucleotide. The four nitrogenous bases present in DNA are adenine (A), guanine (G), cytosine (C) and thymine (T). In RNA, the only differing nitrogenous base is uracil (U) (which replaces thymine in DNA and differs thymine only by the missing methyl group at carbon 5 of the pyrimidine ring) These nitrogenous bases are adenine (A), uracil (U), guanine (G), thymine (T), and cytosine (C). These nitrogenous bases hydrogen bond between opposing DNA strands to form the rungs of the twisted ladder or double helix of DNA or a biological catalyst that is found in the nucleotides. Adenine is always paired with thymine, and guanine is always paired with cytosine. These are known as base pairs. The main biological function of a nitrogenous base is to bond nucleic acids together. A nitrogenous, or nitrogen-containing, base is an organic molecule with a nitrogen atom that has the chemical properties of a base. A nitrogenous base owes its basic properties to the lone pair of electrons of a nitrogen atom. 1 In RNA, Adenine binds to Uracil. 2  These hydrogen-bond interactions between nucleotides C-G and A-T or A-U are referred to as base-pairing or complementary base-pairing. 3  Base-pairing holds the double-stranded DNA molecule together. 4  Base-pairing is necessary for DNA synthesis, RNA synthesis, and Protein synthesis to occur. At left is an unfolded view of a double-stranded DNA molecule, showing the two chains of nucleotides, connected in the center by a series of hydrogen bonds between nitrogenous bases. At right, a schematic illustration showing the arrangement of the two strands in the double-helix configuration. A phosphodiester bond forms between nucleotides to form nucleic acids. Problem: Name the bond that forms between nucleotide groups. While hydrogen bonds do contribute a small amount to the stability of helices, their main contribution is to the specificity of a helix. Hydrogen bonds dictate the complementary base pairing that aligns anti-parallel nucleic acids strands in a DNA helix. Problem: Explain the significance of hydrogen bonds in DNA helices. Chargaff's rule states that the molar ratios of A to T and G to C bases are approximately equal in a DNA helix. This is a result of complementary base pairing between single strands of DNA in a helix. Each A pairs with a T and each G pairs with a C, making their molar ratios equal Covalent (double and single, as well as polar and non-polar) and Hydrogen bonds are found in the DNA molecule.   The backbone of DNA is made of of Phosphate (PO43-) molecul … es and the sugar Deoxyribose (C5H10O4) Attatched to every sugar is a Base (C, G, A or T.) These are held together by single covalent bonds. Base pairs in DNA are attached to each other via hydrogen bonds. The base pairs are attached to the backbone by covalent bonds. The two strands are held together by Hydrogen bonds. These are much weaker than a covalent bond and form between two molecules of opposite polarity. The two atoms, which are of positive and negative charge, are attracted to each other. That attraction is what constitutes a Hydrogen bond. Base pairs in DNA are attached to each other via hydrogen bonds. The base pairs are attached to the backbone by covalent bonds.
http://www.austincc.edu/emeyerth/dna.htm http://www.sparknotes.com/biology/molecular/structureofnucleicacids/section1.rhtml https://en.wikibooks.org/wiki/Structural_Biochemistry/Nucleic_Acid/Nitrogenous_Bases https://en.wikipedia.org/wiki/Nitrogenous_base http://myhome.sunyocc.edu/~weiskirl/nucleotides_nucleicacid.htm http://www.sparknotes.com/biology/molecular/structureofnucleicacids/problems_1.html http://www.answers.com/Q/What_type_of_bond_is_found_between_the_bases_of_the_DNA_molecule http://www.answers.com/Q/What_type_of_bond_is_found_between_the_bases_of_the_DNA_molecule
what type of bond is between nitrogen bases