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DNA is deoxyribonucleic acid, a self-replicating material present in nearly all living organisms as the main constituent of chromosomes. It is the carrier of genetic information.

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Explanation of DNA and Genes (#genetics #dna)

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DNA was known to be a long polymer composed of only four types of sub-units, which resemble one another chemically.

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Genes carry biological information that must be copied accurately for transmission to the next generation each time a cell divides to form two daughter cells.

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Adenine (A)
Thymine (T)
Guanine (G)
Cytosine (C)

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Early in the 1950's, DNA was first examined by x-ray diffraction analysis, a technique for determining the three-dimensional atomic structure of a molecule