noun🔗ShareГуанинA substance first obtained from guano; it is a nucleic base and pairs with cytosine in DNA and RNA (by means of three hydrogen bonds)."The scientist studied the guanine content in the DNA samples from the ancient fossils. "Ученый изучил содержание гуанина в образцах ДНК из древних окаменелостей.biochemistrybiologychemistrysubstancecompoundChat with AIVocabulary GamePractice Reading