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DNA is the string-like structure found in the nucleus of eukaryotic cellsand nucleoid of prokaryotic cells. They are composed of nucleic acid monomers bonded together into a long polymer.
Explanation:
All the information of cells is stored in DNA as genes. This information directs how proteins should be made by the ribosomes (protein manufacturer) through mRNA. Proteins are responsible for the phenotype of a cell.
All cells of a body contain the same DNA. The differences between the type of cells in a body are due to differential silencing of some genes (and keeping genes associated with that particular cell open for transcription) in the cell. The silencing of genes is done by histones that coil up a region of DNA and make the genes in this part inaccessible to RNA polymerase.
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