Can You Describe The Structure Of DNA Molecule?

The structure of DNA was first described in 1953 by James Watson and Francis Crick. That is why a common double helical representation of the DNA is referred to as the Watson and Crick model. The DNA molecule is a double stranded helix that curls around a middle axis. The two helices are joined by hydrogen bonds.
The monomers that make up a DNA molecule are known as nucleotides. Each nucleotide contains one nitrogenous base (purines or pyrimidines). The purines include adenine and guanine and pyrimidines include cytosine and thymine (replaced by uracil in RNA). Besides the bases, each nucleotide has a phosphate group attached to it as well as a sugar group (ribose). Joined together, these make one nucleotide.
Complementary nucleotides line up next to each other (Adenine with thymine and guanine with cytosine). Once they have positioned themselves, hydrogen bonds are formed between them that 'zip' the two strands together. Adenine and thymine have 2 hydrogen bonds between them and guanine and cytosine have 3. The backbone of DNA is made from the sugar phosphate groups and nucleotides determine the sequence of genetic code.
About 10 nucleotide pairs fit into one helical turn and one helical turn is about 3.4nm.

DNA stands for Deoxyribonucleic Acid. It is basically a nucleic acid which contains genetic instructions that are used in development and functioning of every living being and even some viruses. DNA is responsible for storing information for long term.

The structure of DNA was first described by James Watson and Francis Crick in the year 1953. It is characterized by a right handed double helix that has 10 nucleotide pairs per helical turn. Each of the spiral strands is composed of sugar phosphate and attached bases. Each of these strands are connected to a complementary strand through hydrogen bonding between each of the paired bases. The structure is such that adenine pairs up with Thymine and guanine pairs up with cytosine.