nitrogen base

or nitrogenous base

A basic compound that contains nitrogen, such as a purine or pyrimidine.

American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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References in periodicals archive

Your students should realize that the primary structure of the DNA molecule is shown by the sequence of nitrogen bases on the cords, thus the colors.

A simple functioning double helix model

Shaped like a twisted ladder, a DNA molecule contains four nitrogen bases that pair up to create the ladder's "rungs." Adenine (A) binds with thymine (T), and guanine (G) pairs with cytosine (C).

Who dunnit? Wildlife criminals beware: one lab uses high-tech tools and detective work to solve crimes against nature

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