A primitive eukaryote was discovered that displayed a unique nucleic acid as its genetic material. Analysis provided the following information:
(a) The general X-ray diffraction pattern is similar to that of DNA, but with somewhat different dimensions and more irregularity.
(b) A major hyperchromic shift is evident upon heating and monitoring UV absorption at 260 nm.
(c) Base-composition analysis reveals four bases in the following proportions:
Adenine
=
8%
Guanine =
=
37%
Xanthine =
=
37%
Hypoxanthine
=
18%
(d) About 75 percent of the sugars are deoxyribose, while 25 percent are ribose.
Postulate a model for the structure of this molecule that is consistent with the foregoing observations.
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