DNA, or deoxyribonucleic acid, is the hereditary material in humans and almost all other organisms. Nearly every cell in a person’s body has the same DNA. Most DNA is located in the cell nucleus (where it is called nuclear DNA), but a small amount of DNA can also be found in the mitochondria (where it is called mitochondrial DNA or mtDNA).
The information in DNA is stored as a code made up of four chemical bases: adenine (A), guanine (G), cytosine (C), and thymine (T). Human DNA consists of about 3 billion bases, and more than 99 percent of those bases are the same in all people. The order, or sequence, of these bases determines the information available for building and maintaining an organism, similar to the way in which letters of the alphabet appear in a certain order to form words and sentences.
DNA is “the substance that carries the instructions to make life. What carries hereditary information from one generation to the next? How does it all work?” -DNA Interactive… http://www.dnai.org/a/index.html
What is the structure of DNA?
* There is simplicity and symmetry in the patterns of DNA material, making it – a “beautiful molecule”.
* DNA is a double-stranded helix.
* DNA is a three-dimensional structure.
* DNA has a structure made up of four building blocks that are called bases.
- Discovery of DNA Structure and Function: Watson and Crick -From: Scitable… A Collaborative Learning Space for Science
- DNA Interactive -From: Cold Spring Harbor Laboratory. See a very cool Timeline of DNA.
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