Pairs of electrons shared by two atoms
There are two types of bonds in DNA: phosphodiester bonds and hydrogen bonds. The phosphodiester bonds are the strong covalent bonds that create the phosphate-deoxyribose backbone. The hydrogen bonds links the rungs of the ladder, between nitrogen bases. A covalent bond is made out of electrostatic attraction. When 2 or more atoms share electrons, the electrons are attracted to all the 2 or more nuclei of the atoms involved, and this shared attraction holds the molecule together. The sugar-phosphate backbone of DNA is held together by covalent bonds.     The strands of DNA are joined by hydrogen bonds (H-bonds) between the nitrogenous bases o … n either side. Adenine is joined to Thymine by 2 H-bonds. Cytosine is joined to Guanine by 3 H-bonds. There are two types of atomic bonds-ionic bonds and covalent bonds. They differ in their structure and properties. Covalent bonds consist of pairs of electrons shared by two atoms, and bind the atoms in a fixed orientation. Relatively high energies are required to break them (50 - 200 kcal/mol). Covalent bond: bond in which one or more pairs of electrons are shared by two atoms. Ionic bond: bond in which one or more electrons from one atom are removed and attached to another atom, resulting in positive and negative ions which attract each other. Other types of bonds include metallic bonds and hydrogen bonding. So instead the two atoms share 1 or more pairs of electrons, 1 from each atom, each bond being made of one pair of electrons. As the energy levels involved are the valency electrons, and as the two atoms 'co-operate' as it were, this kind of bond is called a covalent bond. Deoxyribonucleic acid, or DNA, is a polymer of nucleotides linked together by specific bonds known as phosphodiester bridges. The phosphate group (PO3) of one nucleotide links to the hydroxyl group (OH) of the following nucleotide. A Covalent bond is a form of chemical bonding that is characterized by the sharing of pairs of electrons between atoms, and other covalent bonds. In short, the attraction-to-r … epulsion stability that forms between atoms when they share electrons is known as covalent bonding.
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covalent bonds in dna are made of what