1. Deoxyribonucleic Acid (DNA)

Figure 4 : Nucleoside = Base + deoxyribose

Figure 4 : Nucleoside = Base + deoxyribose

 Figure 5 : Nucleotides= deoxyribose + base + phosphate group

Figure 5 : Nucleotides= deoxyribose + base + phosphate group

1.1 Nucleotides (continued)

Each base is bonded to a deoxyribose to form a nucleoside.

  • Pyrimidine forms a covalent bond between the nitrogen 1 and the 1' carbon of the deoxyribose.

  • Purine forms a covalent bond between the nitrogen 9 and the 1' carbon of the deoxyribose.

Difference between Nucleosides and Nucleotides:

When a nucleoside is bonded to one or several phosphate groups, it is called a nucleotide.