Primary structure of the molecule: covalent backbone and bases aside
I-1 Phosphoric acid
I-2 Sugar
I-3 Nitrogenous bases
Secondary and tertiary structures of the molecule -Three-dimentional conformation of DNA
II.1 Dinucleotides
II.2 DNA molecule
II.2.1 Hydrogen bonds: bases pairing
II.2.2 Major groove and minor groove
Quaternary structure of the molecule - Chromatin
Various
IV.1 DNA and mitochondria
IV.2 DNA denaturation
1
Shark answered this
Double helix structure
0
Suryans Barmecha answered this
DNA is made up of molecules called nucleotides. Each nucleotide contains a phosphate group, a sugar group and a nitrogen base. The four types of nitrogen bases are adenine (A), thymine (T), guanine (G) and cytosine (C). The order of these bases is what determines DNA's instructions, or genetic code. Human DNA has around 3 billion bases, and more than 99 percent of those bases are the same in all people, according to the U. S. National library of Medicine (NLM).Nucleotides are attached together to form two long strands that spiral to create a structure called a double helix. DNA molecules are long — so long, in fact, that they can't fit into cells without the right packaging. To fit inside cells, DNA is coiled tightly to form structures we call chromosomes. Each chromosome contains a single DNA molecule. Humans have 23 pairs of chromosomes, which are found inside the cell's nucleus.
