What is dna made up of

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Understanding the Composition of DNA

DNA Structure: Deoxyribose Sugar and Double Helix

DNA, or deoxyribonucleic acid, is a molecule that carries the genetic instructions used in the growth, development, functioning, and reproduction of all known living organisms and many viruses. The structure of DNA is composed of two polynucleotide chains that coil around each other to form a double helix. Each of these chains is made up of simpler molecules called nucleotides Butola2016Simion2018Mccarty2003.

Nucleotides: The Building Blocks of DNA

Nucleotides are the basic building blocks of DNA. Each nucleotide consists of three components: a deoxyribose sugar, a phosphate group, and a nitrogenous base. The nitrogenous bases are of four types: adenine (A), cytosine (C), guanine (G), and thymine (T) Simion2018Mccarty2003Dong2020. These bases pair specifically (A with T and C with G) through hydrogen bonds, forming the rungs of the DNA double helix ladder Butola2016Mccarty2003.

Chemical Composition: Pentose Sugar, Nitrogen Base, and Phosphate Group

The DNA molecule is primarily composed of three main components: a pentose sugar (deoxyribose), a nitrogen base, and a phosphate group. The deoxyribose sugar and phosphate groups form the backbone of the DNA strand, while the nitrogen bases are involved in forming the rungs of the ladder-like structure Simion2018Mccarty2003. The specific sequence of these nitrogen bases encodes genetic information .

DNA as a Polymer: Long Chains of Nucleotides

DNA is a long polymer made up of millions of nucleotides. These nucleotides are linked together in a chain by covalent bonds between the phosphate of one nucleotide and the sugar of the next, creating a sugar-phosphate backbone Mccarty2003Doi2008. The two strands of DNA run in opposite directions, making them antiparallel, and they twist to form the double helix structure .

Historical Perspective: Discovery of DNA as Genetic Material

The identification of DNA as the genetic material was a significant milestone in molecular biology. In 1944, Oswald Avery, Maclyn McCarty, and Colin MacLeod demonstrated that DNA is the substance that carries genetic information, overturning the previous belief that proteins were the genetic material . This discovery laid the foundation for modern genetics and our understanding of DNA's role in heredity.

Conclusion

DNA is a complex molecule composed of deoxyribose sugar, phosphate groups, and nitrogenous bases. These components form nucleotides, which are the building blocks of the DNA double helix. The specific pairing of nitrogenous bases encodes genetic information, making DNA the fundamental molecule for inheritance and biological function. Understanding the structure and composition of DNA is crucial for advancements in genetics, biotechnology, and medicine.

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Most relevant research papers on this topic

Chemical Structure of DNA

DNA molecule is made up of deoxyribose sugar and two polynucleotide chains, each containing four different types of nucleotide subunits.

2016·

2citations

·Varsha Butola et al.

Research and Reviews: Journal of Chemistry

DNA Replication

DNA replication is a complex process that ensures near perfect fidelity, with each strand serving as a template for the production of the complementary strand.

2018·

0citations

·Tariku Simion

Current Trends in Biomedical Engineering & Biosciences·

DOI

Discovering genes are made of DNA

Maclyn McCarty, the sole surviving member of the team that discovered DNA as the material of inheritance in 1944, recalls the times and the impact of the double helix on modern genetics.

2003·

28citations

·M. Mccarty

Nature·

DOI

Engineering DNA-based functional materials.

DNA-based functional materials show promise for nanotechnology, medicine, and biotechnology due to their engineering methods and potential real-world applications.

Highly Cited

2011·

233citations

·Y. Roh et al.

Chemical Society reviews·

DOI

Artificial DNA made exclusively of nonnatural C-nucleosides with four types of nonnatural bases.

Artificial DNA made of nonnatural C-nucleosides shows potential for future extracellular genetic systems with information storage and amplifiable abilities.

2008·

62citations

·Y. Doi et al.

Journal of the American Chemical Society·

DOI

A DNA-fuelled molecular machine made of DNA

A DNA machine, shaped like a pair of tweezers, can be used as both a structural material and as 'fuel', enabling nanoscale construction and active devices.

Highly Cited

2000·

2140citations

·B. Yurke et al.

Nature·

DOI

Biophysics of the DNA molecule

DNA plays a crucial role in all living organisms because it is the key molecule responsible for storage, duplication, and realization of genetic information. DNA is a heteropolymeric molecule consisting of residues (nucleotides) of four types, A, T, C and G. Fig. 1 shows the chemical structure of the DNA single strand and the complementary base pairs. The genetic message is “written down” in the form of continuous text consisting of four letters (DNA nucleotides A, G, T and C). This continuous text, however, is subdivided, in its biological meaning, into sections. The most significant sections are genes, parts of DNA, which carry information about the sequence of amino acids in proteins. The importance of the DNA molecule cannot be overestimated. It is therefore natural that the molecule has been attracting attention not only of biologists and physicians but also of chemists and physicists, even theorists (for a popular introduction into the field of DNA science, see, e.g., Frank-Kamenetskii, 1993; 1997). For more than forty years already, the DNA molecule has been a subject of biophysical studies. Many outstanding physicists, who made their names in various areas of traditional physics, mostly in solid state physics, contributed by studying DNA. I.M. Lifshitz did not publish many papers about DNA. Nevertheless, his role in directing attention of physicists toward DNA biophysics was very significant, especially in the USSR. Although I had been already in the field when Lifshitz stormed it in mid-1960s I also experienced profound influence of his personality and style. Due to his enthusiasm and indisputable reputation among Soviet physicists, DNA and protein biophysics temporarily became a focus of attention of the Soviet physics community. This community was a unique phenomenon in the world of science. Due to I.M. Lifshitz, I had an opportunity to present my work on DNA topology at the famous

Highly Cited

1997·

102citations

·M. Frank-Kamenetskii

Physics Reports·

DOI

DNA Functional Materials Assembled from Branched DNA: Design, Synthesis, and Applications.

Branched DNA functional materials offer versatile building blocks for biomaterials, with potential applications in diagnostics, protein engineering, drug delivery, therapeutics, and cell engineering.

Highly Cited

2020·

382citations

·Yuhang Dong et al.

Chemical reviews·

DOI

How are small ions involved in the compaction of DNA molecules?

Small ions play a critical role in DNA compaction, affecting the folding transition and resulting single-chain morphologies.

2007·

30citations

·Takafumi Iwaki et al.

Colloids and surfaces. B, Biointerfaces·

DOI

Self-assembled nanostructures based on DNA: towards the development of nanobiotechnology.

DNA-based nanostructures show promise for artificial nanostructured devices and the development of nanobiotechnology.

Highly Cited

2000·

204citations

·Christof M. Niemeyer

Current opinion in chemical biology·

DOI

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