DNA Primary Structure - Double Helix

This section provides a quick introduction of the primary structure of a DNA (Deoxyribonucleic Acid), which is a double helix formed by the backbones of two complementary DNA sequences paired together.

What Is the primary structure of a DNA? - Like RNA, the primary structure of a DNA (Deoxyribonucleic Acid) is also the helix conformation formed by the backbone (the chain of sugar-phosphate pairs) of its nucleotide residue sequence.

However, in most situations, two complementary DNA sequences are always paired together to form the double helix conformation. See the diagram below (source: chandlerphysicaltherapy.net):

DNA Primary Structure - Double Helix
DNA Primary Structure - Double Helix

In a DNA double helix, all nucleobases in one DNA sequence are paired one-by-one with nucleobases of the other DNA sequence. See next section for details on nucleobase pairs.

Table of Contents

 About This Book

 Introduction of Molecules

 Molecule Names and Identifications

 Molecule Mass and Weight

 Protein and Amino Acid

Nucleobase, Nucleoside, Nucleotide, DNA and RNA

 What Is Nucleobase

 What Is Nucleoside

 What Is Nucleotide

 What Is Nucleic Acid

 What Is RNA (Ribonucleic Acid)

 What Is DNA (Deoxyribonucleic Acid)

 RNA Primary Structure - Helix

DNA Primary Structure - Double Helix

 What Is DNA/RNA Base and Sequence Pair

 What Is Chromosome

 Gene and Chromosome

 Protein Kinase (PK)

 DNA Sequencing

 Gene Mutation

 SDF (Structure Data File)

 PyMol Installation

 PyMol GUI and CLI

 PyMol Selections

 PyMol Editing Functions

 PyMol Measurement Functions

 PyMol Movie Functions

 PyMol Python Integration

 PyMol Object Functions

 ChEMBL Database - European Molecular Biology Laboratory

 PubChem Database - National Library of Medicine

 PDB (Protein Data Bank)

 INSDC (International Nucleotide Sequence Database Collaboration)

 HGNC (HUGO Gene Nomenclature Committee)

 Relocated Tutorials

 Resources and Tools

 Molecule Related Terminologies

 References

 Full Version in PDF/EPUB