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| Symbol: Lr; atomic weight 260; atomic number: 103 |
| Symbol: Mg; atomic weight: 24.312; atomic number: 12 |
Watson-Crick model n.
A three-dimensional model of the DNA molecule, consisting of two polynucleotide strands wound in the form of a double helix and joined in a ladderlike fashion by hydrogen bonds between the purine and pyrimidine bases.