1) Adenine 2) Guanine
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1) Alkali 2) Base
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https://www.crosswordclues.com/clue/purine
A purine is a heterocyclic aromatic organic compound. It consists of a pyrimidine ring fused to an imidazole ring. Purines, which include substituted purines and their tautomers, are the most widely occurring nitrogen-containing heterocycle in nature. Purines and pyrimidines make up the two groups of nitrogenous bases, including the two groups of ...
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http://en.wikipedia.org/wiki/Purine
any of a class of organic compounds of the heterocyclic series characterized by a two-ringed structure composed of carbon and nitrogen atoms. The ... [7 related articles]
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http://www.britannica.com/eb/a-z/p/134
One of two chemical compounds that cells use to make the building blocks of DNA and RNA. Examples of purines are adenine and guanine. Purines are also found in meat and meat products. They are broken down by the body to form uric acid, which is passed in the urine. High levels of uric acid in the body may cause gout.
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http://www.cancer.gov/dictionary?expand=P
Any of a group of nitrogen-containing, organic bases, the molecules of which have a double-ring structure. Purines are the larger of the two types of nitrogenous base found in DNA and RNA (the other being pyrimidines). Adenine and guanine are purines. Purines are synthesized in the body or produce...
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http://www.daviddarling.info/encyclopedia/P/purine.html
<biochemistry, molecular biology> A heterocyclic compound with a fused pyrimidine/imidazole ring. Planar and aromatic in character. The parent compound for the purine bases of nucleic acids. ... (18 Nov 1997) ...
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(pu´rēn) a heterocyclic compound that is the nucleus of the purine bases such as adenine and guanine (which occur in DNA and RNA), and xanthine and hypoxanthine.
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A nitrogen-containing, double-ring, basic compound that occurs in nucleic acids. The purines in dna
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http://www.encyclo.co.uk/local/22391
A heterocyclic compound with a fused pyrimidine/imidazole ring. Planar and aromatic in character. The parent compound for the purine bases of nucleic acids.
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(Pur) Type: Term Pronunciation: pyūr′ēn, -rin Definitions: 1. The parent substance of adenine, guanine, and other naturally occurring purine 'bases.'
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http://www.medilexicon.com/medicaldictionary.php?t=74180
Purine: One of the two classes of bases in DNA and RNA. The purine bases are guanine (G) and adenine (A). Uric acid, the offending substance in gout, is a purine end-product.
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http://www.medterms.com/script/main/art.asp?articlekey=5136
[
n] - any of several bases that are derivatives of purine 2. [n] - a colorless crystalline nitrogen-containing organic base
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http://www.webdictionary.co.uk/definition.php?query=purine
noun a colorless crystalline organic base containing nitrogen; the parent compound of various biologically important substances
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A nitrogen- containing, single- ring, basic compound that occurs in nucleic acids. The purines in DNA and RNA are adenine and guanine.
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a white, crystalline compound, CHN, from which is derived a group of compounds including uric acid, xanthine, and caffeine. · one of several purine derivatives, esp. the bases adenine and guanine, which are fundamental constituents of nucleic acids.
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https://www.infoplease.com/dictionary/purine
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