A primitive eukaryote was discovered that displayed a unique nucleic acid as its genetic material. Analysis provided the following information: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.

In some organisms, cytosine is methylated at carbon 5 of the pyrimidine ring after it is incorporated into DNA. If a 5-methyl cytosine molecule is then hydrolyzed, as described in Problem 28, what base will be generated?

Consider the drawing of a dinucleotide below. Suppose that the molecule was cleaved with the enzyme spleen phosphodiesterase, which breaks the covalent bond connecting the phosphate to C-5'. After cleavage, to which nucleoside is the phosphate now attached (A or T)?

Consider the drawing of a dinucleotide below. Is the arrow closest to the 5' or the 3' end?

Consider the drawing of a dinucleotide below. Is it DNA or RNA?

A primitive eukaryote was discovered that displayed a unique nucleic acid as its genetic material. Analysis provided the following information:Base-composition analysis reveals four bases in the following proportions:Adenine = 8%Guanine = 37%Xanthine = 37%Hypoxanthine = 18%

Newsdate: March 1, 2030. A unique creature has been discovered during exploration of outer space. Recently, its genetic material has been isolated and analyzed. This material is similar in some ways to DNA in its chemical makeup. It contains in abundance the 4-carbon sugar erythrose and a molar equivalent of phosphate groups. In addition, it contains six nitrogenous bases: adenine (A), guanine (G), thymine (T), cytosine (C), hypoxanthine (H), and xanthine (X). These bases exist in the following relative proportions:A =T = H and C = G = XX-ray diffraction studies have established a regularity in the molecule and a constant diameter of about 30 Å. Together, these data have suggested a model for the structure of this molecule.Given the constant diameter of 30 Å, do you think that either (i) both H and X are purines or both pyrimidines, or (ii) one is a purine and one is a pyrimidine?

Newsdate: March 1, 2030. A unique creature has been discovered during exploration of outer space. Recently, its genetic material has been isolated and analyzed. This material is similar in some ways to DNA in its chemical makeup. It contains in abundance the 4-carbon sugar erythrose and a molar equivalent of phosphate groups. In addition, it contains six nitrogenous bases: adenine (A), guanine (G), thymine (T), cytosine (C), hypoxanthine (H), and xanthine (X). These bases exist in the following relative proportions:A =T = H and C = G = XX-ray diffraction studies have established a regularity in the molecule and a constant diameter of about 30 Å. Together, these data have suggested a model for the structure of this molecule.What base-pairing properties must exist for H and for X in the model?

Newsdate: March 1, 2030. A unique creature has been discovered during exploration of outer space. Recently, its genetic material has been isolated and analyzed. This material is similar in some ways to DNA in its chemical makeup. It contains in abundance the 4-carbon sugar erythrose and a molar equivalent of phosphate groups. In addition, it contains six nitrogenous bases: adenine (A), guanine (G), thymine (T), cytosine (C), hypoxanthine (H), and xanthine (X). These bases exist in the following relative proportions:A =T = H and C = G = XX-ray diffraction studies have established a regularity in the molecule and a constant diameter of about 30 Å. Together, these data have suggested a model for the structure of this molecule.Propose a general model of this molecule. Describe it briefly.