. Biophysical science. Biophysics. 5 : 6/ X-ray Analyses of Proteins and Nucleic Acids 293 are of the proper shape. On the basis of chemical data and size con- siderations, Crick and Watson showed that the chains were made up of -sugar->phosphate-sugar-^phosphate- and so forth, units. Between the two chains, as rungs along a helical step ladder, were strung pairs of. Figure 12. Double chain of DNA. hydrogen-bonded bases of the form purine-H-pyrimidine. These rungs are about 11 A long. A piece of a pair of chains is shown in Figure 12. This type of unit is repeated into a long double chain.
. Biophysical science. Biophysics. 5 : 6/ X-ray Analyses of Proteins and Nucleic Acids 293 are of the proper shape. On the basis of chemical data and size con- siderations, Crick and Watson showed that the chains were made up of -sugar->phosphate-sugar-^phosphate- and so forth, units. Between the two chains, as rungs along a helical step ladder, were strung pairs of. Figure 12. Double chain of DNA. hydrogen-bonded bases of the form purine-H-pyrimidine. These rungs are about 11 A long. A piece of a pair of chains is shown in Figure 12. This type of unit is repeated into a long double chain. The entire double chain is then twisted to form the double helix shown in Figure 13,. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Ackerman, Eugene, 1920-. Englewood Cliffs, N. J. , Prentice-Hall
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