The chemical structure of nucleic acids

1.Drawing nucleotides using Marvin sketch

Figure 1 shows the structural formulas of nucleotides and nucleosides. Atoms forming the N-glycosidic bond are marked in red.

Fig.1 The structural formulas of nucleotides and nucleosides.

A file with the task can be viewed at the link

2. Drawing a fragment of a double-stranded DNA molecule.

Figure 2 shows the structural formula of a double-stranded DNA fragment

Fig.2 The structural formula of a double-stranded DNA fragment.