The bonds or interactions that hold together adjacent nucleotides in the sugar-phosphate backbone of DNA are covalent bonds , the bonds or interactions that hold together complementary bases from opposite strands of DNA are hydrogen bonds and the bonds or interactions between stacked nucleotide units that help hold the DNA molecule together are van der Waals interactions.
What is DNA?
Two polynucleotide chains that are joined together to create a double helix make up the polymer DNA. All known living things, including many viruses, have genetic material in their polymers that direct how they should function, grow, and reproduce. Nucleic acids include ribonucleic acid (RNA) and DNA. The four main macromolecule categories that are necessary for all known forms of life are proteins, lipids, complex carbohydrates (polysaccharides), and nucleic acids.
Two types of bonds, covalent and hydrogen, hold the DNA double helix together. The bases, sugars, and phosphate groups are firmly connected by covalent connections that exist within each linear thread (both within and between components). Between the two strands, hydrogen bonds are formed by the complementary pairing of bases from the first and second strands. Although each of these hydrogen connections is weak, as a whole, they are rather powerful.
Hence, the bonds or interactions that hold together adjacent nucleotides in the sugar-phosphate backbone of DNA are covalent bonds , the bonds or interactions that hold together complementary bases from opposite strands of DNA are hydrogen bonds and the bonds or interactions between stacked nucleotide units that help hold the DNA molecule together are van der Waals interactions.
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