The DNA molecule is a polymer of nucleotides. Each nucleotide is composed of a nitrogenous base, a five-carbon sugar (deoxyribose), and a phosphate group. There are four nitrogenous bases in DNA, two purines (adenine and guanine) and two pyrimidines (cytosine and thymine). A DNA molecule is composed of two strands.
The process of building DNA molecule by the joining of nucleotides can be found below
WHAT ARE NUCLEOTIDES?
Nucleotidesare monomeric units of nucleic acids such as DNA and RNA. Nucleotides that form the DNA molecule are made up of three components namely: nitrogenous bases (A, C, G, T), phosphate group, and deoxyribose sugar.
DNA molecule is formed when nucleotides come together to form hydrogen bonds between adjacent nitrogenous bases.
Adenine pairs with Thymine while Guanine pairs with Cytosine in the DNA molecule via hydrogen bonds.
However, the double strand of DNA is formed when the sugar and phosphate group bonds with the aid of a bond called phosphodiester bond.
