Figure 1 Graphic representation of central dogma of molecular biology Image: "Central Dogma of Molecular Biochemistry with Enzymes" by D3r1 via Wikimedia Commons, used under CC BY-SA 3.0. Figure 2 Reverse transcription or Reverse central dogma of molecular biology Image: "Extended Central Dogma with Enzymes" by D3r1 via Wikimedia Commons, used under CC BY-SA 3.0. Figure 3 Structure of nucleotide Image source: "Figure 3.22: DNA Nucleotides" by OpenStax is licensed under CC BY 4.0. Access for free at openstax.org. Figure 4 Structure of pentose sugars in nucleotide Image source: OpenStax College, CC BY 3.0 <https://creativecommons.org/licenses/by/3.0>, via Wikimedia Commons Figure 5 Nitrogen bases in nucleic acids Source: https://2012books.lardbucket.org/books/introduction-to-chemistry-general-organic-and-biological Watson and Crick showing the three dimensional model of DNA prepared using metal scraps FIO054: Figure 5.8c” by Rosenfeld M...