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nitrogen base

or nitrogenous base

Chemistry, Biochemistry. a nitrogen-containing organic compound that has the chemical properties of a base, especially a pyrimidine or purine:
Four nitrogen bases are present in a DNA molecule. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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nitrogen-base in Science
nitrogen base  
One of the nitrogen-containing purines (adenine or guanine) or pyrimidines (cytosine, thymine, or uracil) found in the nucleic acids DNA and RNA. The bases may be attached to a sugar (deoxyribose in DNA, ribose in RNA) to form nucleosides.The addition of a phosphate to a nucleoside results in the formation of a nucleotide, which is the basic constituent of nucleic acids.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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