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DNA (Deoxyribonucleic Acid) is a molecule that carries most of the genetic instructions used in development, functioning and reproduction of all known living organisms.
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Chromosome: A long thread-like structure composed primarily of protein and DNA that carries genetic information.
Gene: A segment on the chromosome containing instructions for making specific proteins or sets of proteins.
Double Helix: The shape that two linear strands of DNA assume when bonded together - similar to a twisted ladder or spiral staircase.