All GRE Subject Test: Chemistry Resources
Example Questions
Example Question #4 : Structure Of Dna And Rna
Of the following groups of nitrogenous bases, which does not contain a purine?
Possible Answers:
Thymine, adenine, cytosine
Cytosine, thymine, uracil
Adenine, guanine, thymine
Guanine, uracil, adenine
Cytosine, thymine, guanine
Correct answer:
Cytosine, thymine, uracil
Explanation:
We can use the mnemonic "PurAG" to remember that the purines are adenine and guanine. The only choice that does not contain a purine, therefore, is "cytosine, thymine, and uracil." Remember, pyrimidines contain a single ring, while purines have two.
Gregory
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All GRE Subject Test: Chemistry Resources
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