deoxyribonucleic acid (DNA)


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deoxyribonucleic acid (DNA)

a long macromolecule in the nucleus of animal and plant cells, which stores genetic information in its component genes, and instructions for their expression in controlling function and development. Each strand is closely linked to another in a double helix. There is also a small amount of mitochondrial DNA which carries only maternal genetic material, being transmitted in ova but not in sperm.
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