All GRE Subject Test: Chemistry Resources
Example Questions
Example Question #1 : Structure Of Dna And Rna
Of the following groups of nitrogenous bases, which does not contain a purine?
Possible Answers:
Adenine, guanine, thymine
Guanine, uracil, adenine
Cytosine, thymine, uracil
Cytosine, thymine, guanine
Thymine, adenine, cytosine
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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Pennsylvania State University-Main Campus, Bachelor of Science, Chemical Engineering. Carnegie Mellon University, Doctor of P...
Yongmao
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Nankai University, Bachelor of Science, Chemistry. Washington University in St Louis, Doctor of Philosophy, Organic Chemistry.
All GRE Subject Test: Chemistry Resources
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