Describe primary and secondary structure of DNA.

The structure of DNA, or deoxyribonucleic acid, is a crucial aspect of molecular biology, and it can be understood in terms of its primary and secondary structures. These structures are essential for the storage, transmission, and replication of genetic information within cells.

### Primary Structure of DNA

The primary structure of DNA refers to the sequence of nucleotides that make up the DNA strand. A nucleotide is composed of three components: a phosphate group, a deoxyribose sugar molecule, and a nitrogenous base. There are four types of nitrogenous bases in DNA: adenine (A), thymine (T), cytosine (C), and guanine (G). The primary structure is essentially the linear sequence of these nitrogenous bases linked by the sugar-phosphate backbone. 

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