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Long-form of DNA.

Answer
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Hint: An organic chemical molecule found in all prokaryotic and eukaryotic cells. It is the hereditary material in humans and almost all other organisms.

Complete answer:
The full form of DNA is Deoxyribonucleic Acid. DNA is a set of molecules responsible for the transmitting and carrying the inherited materials or genetic instructions from parents to children.
DNA is composed of a pentose sugar, phosphoric acid, and nitrogenous bases (purine and pyrimidine).

Additional Information: -DNA contains the genetic material of a person as well as the human genome.
-Its chemistry shows that it is a compound of several smaller molecules linked together.
-The two DNA strands are known as Polynucleotides as they are composed of simpler monomeric units called nucleotides.
-Each nucleotide is composed of one of the four nitrogen-containing nucleobases which are: cytosine, guanine, adenine, or thymine.
-It is an organic compound that has a unique molecular structure. It is found in all eukaryotic and prokaryotic cells.
-The molecule of DNA is a double helix structure which is negatively charged.
-Humans have approximately 20,000 – 25,000 protein-coding genes.
-DNA is also responsible for introducing a mutation in the species by random rearrangement of gene sequences or recombination during reproduction.
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Note: The DNA was first named and recognized by Johannes Friedrich Miescher in 1869, during his work on white blood cells. There are different types of DNA, they are A-DNA, B-DNA, and Z-DNA.