EDWARD KINSMAN / SCIENCE PHOTO LIBRARY EDWARD KINSMAN / SCIENCE PHOTO LIBRARY
DNA is a long chain-like structure formed by alternating molecules of phosphoric acid and deoxyribose. Each molecule links four substances (adenine, thymine, cytosine, guanine). Each DNA molecule forms a chromosome. The two spiralling chains form a helix. Genes transmitted from generation to generation are different sequences of nucleic acids on the chromosome.
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