Problem

A primitive eukaryote was discovered that displayed a unique nucleic acid as its genetic m...

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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