DNA, which stands for deoxyribonucleic acid, is defined as a nucleic acid that contains the genetic code.
Facts About DNA
- It is a long polymer that is composed of repeating nucleotides.
- The largest DNA polymer that is known is about two hundred and twenty million base pairs long.
- In 1869, the physician Friedrich Miescher first isolated DNA. While examining the substance of pus in surgical bandages, he observed a microscopic substance in the pus. He named it nuclein because he observed it in the nuclei of cells.
- In 1928, Frederick Griffith realized that DNA might actually hold genetic information. In 1952, Alfred Hershey and Martha Chase performed an experiment which confirmed that DNA had a role in heredity.
- In 1953, James D. Watson and Francis Crick proposed the idea that the DNA’s structure was a double-helix.
- It was not until scientists used x-ray technology that they were to finally able to see the structure of a DNA molecule. In 1953 Rosalind Franklin was the first to take the most accurate picture, which became known as photograph 51, that truly defined the structure of the double helix shape of DNA.
- In 1962, the Nobel Peace Prize was given to James Watson, Francis Crick, and Maurice Wilkins (an associate of Franklin who had died by 1962.).
An example of DNA is the chain of basic materials in the chromosomes of the human cell.
A DNA model.
DNA definition by Webster's New World
Origin: d(eoxyribo)n(ucleic) a(cid)
DNA definition by American Heritage Dictionary
Origin: d(eoxyribo)n(ucleic) a(cid).
double-helix DNA modelA. adenine T. thymine C. cytosine G. guanine D. deoxyribose P. phosphate
dna - Computer Definition
(1) See Windows DNA.
(2) (Digital Network Architecture) Introduced in 1978, it was Digital's umbrella term for its enterprise network architecture based on DECnet.
DNA - Cultural Definition
The molecule that carries genetic information in all living systems (see genetic code). The DNA molecule is formed in the shape of a double helix from a great number of smaller molecules (see nucleotides). The workings of the DNA molecule provide the most fundamental explanation of the laws of genetics.
DNA acts in three important way. First, when a cell divides, the DNA uncoils, and each strand creates a new partner from the surrounding material — a process called replication. The two cells that result from the cell division have the same DNA as the original (see mitosis). Second, in sexual reproduction, each parent contributes one of the two strands in the DNA of the offspring. Third, inside the cell, the DNA governs the production of proteins and other molecules essential to cell function.
dna - Medical Definition
double helix molecule containing nucleotide bases adenine (A), guanine (G), cytosine (C), and thymine (T)
dna - Science Definition
adenine (a), cytosine (c), guanine (g), and thymine (t)