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Purpose of DNA
DNA's Functional 'Biological' Purpose:
DNA has two main biological functions (aside from being a very elegant looking macromolecule). Primarily, it serves to store/determine the biological characteristics of any living thing according to a very specific arrangement of molecular connections, as will be defined in a later section of this site. Secondarily, DNA serves the purpose of biological synthesis in terms of the creation of cellular proteins and RNA molecules.
Primary Purpose: (Information Storage)
The DNA molecule consists of two long polymer chains of simpler molecular units called nucleotides. The nucleotides have 'backbones' attached to them made out of sugars and phosphates. Attached to each sugar molecule is a specific 'base' (where base refers to the 'basic necessity' of the component within the DNA chain, rather than any other chemical representations).
These bases, defined later within the site, attach to each other through hydrogen bonds. It is the sequencing of the bases which connect the two polymer strands together that ultimately determines the natural characteristics of the biological entity in which that (particular) DNA exists.
Thus, genetic coding is born, where a lifeforms physical traits and characteristics are stored within the molecular formula of this particular macromolecule.
Secondary Purpose: (RNA Synthesis)
DNA directs the synthesis of RNA under a chemical process known as transcription. Basically, what happens, is that cellular enzymes are directed by the genetic code itself to recreate strands of RNA in relation to the coded sequences stored in the DNA itself. These strands, known as mRNA (or Messenger RiboNucleic Acid), carry information about the genetic code into the protein-synthesizing mechanics of the cell, whereby, they induce a particular arrangement of amino acids within the protein assembly, which in turn dictates and governs the physiological characteristics of the organism in question.
DNA, RNA and mRNA are basically all constructed the same way, except for a slight difference in one of the four bases that make up the connections of the nucleotide molecules. Because of this, the transcription process is a relatively simple process, despite the large number of sequences involved in the process itself.
Thus the information 'stored' in the genetic code of the DNA sequence is now 'transcribed' into a 'messenger' function, which illicits a specific type of development from the cell itself in terms of protein fabrication, which in turn ultimately determines the nature of growth that develops from the DNA 'seed'.
Purpose of DNA - Books on Sale and More
Description : According to American Demographics, 113 million Americans have begun to trace their roots, making genealogy the second most popular hobby in the country (after gardening). Enthusiasts clamor for new information from dozens of subscription-based websites, email newsletters, and magazines devoted to the subject. For these eager roots-seekers looking to take their searches to the next level, DNA testing is the answer.
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Description : The work of geneticists who have labored for years to map human DNA is the subject of this offbeat yet highly informative documentary from the PBS series Nova. Host Robert Krulwich, a correspondent for ABC Nightline, visits with scientists who explain, in terms understandable to laymen, the enormous challenges faced and overcome by scientists working on the Human Genome Project.
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Description : What makes DNA different from hordes of competitors purporting to help readers understand genetics is that it is written by none other than James Watson, of Watson and Crick fame. He and his co-author Andrew Berry have produced a clear and easygoing history of genetics, from Mendel through genome sequencing. Watson offers readers a sense of immediacy, a behind-the scenes familiarity with some of the most exciting developments in modern science.
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Description : Head into the lab for an in-depth investigation of genetics, the branch of biology focused on heredity and variation in organisms, and DNA, the acid that holds the blueprints for life.
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Description : Intended as a companion to the Fundamentals of Forensic DNA Typing volume published in 2009, Advanced Topics in Forensic DNA Typing: Methodology contains 18 chapters with 4 appendices providing up-to-date coverage of essential topics in this important field and citation to more than 2800 articles and internet resources.
Keywords : Advanced Topics In Forensic Dna Typing, Purpose Of Dna, John Butler
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