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Chargaff's rules, the structure of dna, nucleotides, dna replication, complementary base pairing, and the components of dna. Learn about chargaff's discoveries regarding the nitrogen bases in dna, the double helix structure, and the importance of complementary base pairing in maintaining the dna molecule's shape.
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Note: specific sequence of A, T, C, and G nucleotides within an organism's DNA is unique to that individual, and it is this sequence that controls not only the operations within a particular cell, but within the organism as a whole.
scientist Rosalind Franklin used a process called X-ray diffraction to capture images of DNA molecules. Dr. Franklin interpreted the black lines in photos as representing distances between the nucleotides that were arranged in a spiral shape called a helix.
Watson and Crick : DNA actually takes the form of a double helix , a ladder-like structure that is twisted along its entire length (Figure 6). Franklin, Watson, and Crick all published articles describing their related findings in the same issue of Nature in 1953.
100 trillion cells DNA in each cell nearly two meters long