from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A purine base, C5H5ON5, that is an essential constituent of both RNA and DNA.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A substance first obtained from guano; it is a nucleic base and pairs with cytosine in DNA and RNA.
from The Century Dictionary and Cyclopedia
- n. A substance (C5H5N5O) contained in guano.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. a purine base found in DNA and RNA; pairs with cytosine
The bird droppings, applied in a 90- minute facial, are packed with an enzyme called guanine – an amino acid which heals the skin, experts claim.
The bird droppings, applied in a 90-minute facial, are packed with an enzyme called guanine — an amino acid which heals the skin, experts claim.
the droppings, which contain an enzyme called guanine
it was thanks to the droppings, which contain an enzyme called guanine that leaves the skin clean, smooth and supple.
I’m really sorry, but I just want to scream when they call guanine and enzyme and an amino acid.
I have spent time, too much time, trying to explain minutiae such as guanine and cytosine having 3 hydrogen bonds while adenine and thymine have two or is it the other way round when much of my class is amazed that a bean from a Goya package will grow when stuck in the ground.
Furthermore, although Powner and colleagues 'synthetic sequence yields the pyrimidine ribonucleotides, it cannot explain how purine ribonucleotides (which incorporate guanine and adenine) might have formed.
For 40 years, efforts to understand the prebiotic synthesis of the ribonucleotide building blocks of RNA have been based on the assumption that they must have assembled from their three molecular components: a nucleobase (which can be adenine, guanine, cytosine or uracil), a ribose sugar and phosphate.
Two spots shined red: a layer of guanine crystals formed the Tapetum lucidum, the bright carpet of its eyes.
Each nucleotide unit is composed of a sugar, a phosphate, and one of four bases, adenine, cytosine, guanine, or thymine.