1) Alkali 2) Base
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1) Cytosine 2) Thymine
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https://www.crosswordclues.com/clue/pyrimidine
Pyrimidine is an aromatic heterocyclic organic compound similar to pyridine. One of the three diazines (six-membered heterocyclics with two nitrogen atoms in the ring), it has the nitrogens at positions 1 and 3 in the ring. The other diazines are pyrazine (nitrogens 1 and 4) and pyridazine (nitrogens 1 and 2). In nucleic acids, three types of nucl...
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http://en.wikipedia.org/wiki/Pyrimidine
any of a class of organic compounds of the heterocyclic series characterized by a ring structure composed of four carbon atoms and two nitrogen ... [6 related articles]
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http://www.britannica.com/eb/a-z/p/137
One of two chemical compounds that cells use to make the building blocks of DNA and RNA. Examples of pyrimidines are cytosine, thymine, and uracil. Cytosine and thymine are used to make DNA and cytosine and uracil are used to make RNA.
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http://www.cancer.gov/dictionary?expand=P
<biochemistry> A family of 6-membered heterocyclic compounds occurring in nature in a wide variety of forms. They are planar and aromatic in character and include several nucleic acid constituents (cytosine, thymine, and uracil) and form the basic structure of the barbiturates. ... It is the parent compound of the pyrimidine bases of nucleic ...
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(pә-rim´ĭ-dēn) an organic compound that is the fundamental form of the pyrimidine bases, which include cytosine, thymine, and uracil.
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A nitrogen-containing, single-ring, basic compound that occurs in nucleic acids. The pyrimidines in
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http://www.encyclo.co.uk/local/22391
(= 1,3 diazine) A heterocyclic 6-membered ring, planar and aromatic in character. The parent compound of the pyrimidine bases of nucleic acid.
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(Pyr) Type: Term Pronunciation: pī-rim′i-dēn Definitions: 1. a heterocyclic substance, the formal parent of several 'bases' present in nucleic acids (uracil, thymine, cytosine) as well as of the barbiturates.
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http://www.medilexicon.com/medicaldictionary.php?t=74500
Pyrimidine: One of the two classes of bases in DNA and RNA. The pyrimidine bases are thymine (T) and cytosine (C) in DNA and thymine (T) and uracil (U) in RNA.
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[
n] - any of several basic compounds derived from pyrimidine 2. [n] - a heterocyclic organic compound with a penetrating odor
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http://www.webdictionary.co.uk/definition.php?query=pyrimidine
noun a heterocyclic organic compound with a penetrating odor
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A nitrogen- containing, double- ring, basic compound that occurs in nucleic acids. The pyrimidines in DNA are cytosine and thymine; in RNA, cytosine and uracil.
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https://www.encyclo.co.uk/local/21029
a heterocyclic compound, CHN, that is the basis of several important biochemical substances. · one of several pyrimidine derivatives, esp. the bases cytosine, thymine, and uracil, which are fundamental constituents of nucleic acids.
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https://www.infoplease.com/dictionary/pyrimidine
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