
The main biological function of a nitrogenous base is to bond nucleic acids together. A nitrogenous, or nitrogen-containing, base is an organic molecule with a nitrogen atom that has the chemical properties of a base. A nitrogenous base owes its basic properties to the lone pair of electrons of a nitrogen atom. Nitrogenous bases are typically clas...
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http://en.wikipedia.org/wiki/Nitrogenous_base

<biochemistry> A nitrogen-containing molecule having the chemical properties of a base. ... (09 Oct 1997) ...
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http://www.encyclo.co.uk/local/20973

an aromatic, nitrogen-containing molecule that serves as a proton acceptor, such as purine or pyrimidine.
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http://www.encyclo.co.uk/local/21001

A nitrogen-containing molecule having the chemical properties of a base. Dna contains the nitrogenou
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http://www.encyclo.co.uk/local/22391

Nitrogenous base: A molecule that contains nitrogen and has the chemical properties of a base. The nitrogenous bases in DNA are adenine (A), guanine (G), thymine (T), and cytosine (C). The nitrogenous bases in RNA are the same with one exception: adenine (A), guanine (G), uracil (U), and cytosine (C)
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http://www.medterms.com/script/main/art.asp?articlekey=4568

nitrogen-containing ring structure within a nucleotide that is responsible for complementary base pairing between nucleic acid strands
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https://courses.lumenlearning.com/microbiology/chapter/glossary/

A nitrogen- containing molecule having the chemical properties of a base.
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https://www.encyclo.co.uk/local/21029
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