cytosine

noun
cy·​to·​sine | \ˈsī-tə-ˌsēn \

Definition of cytosine 

: a pyrimidine base C4H5N3O that codes genetic information in the polynucleotide chain of DNA or RNA — compare adenine, guanine, thymine, uracil

Examples of cytosine in a Sentence

Recent Examples on the Web

To form the i-motif, the double helix untwists and then one of the strands bunches up with a bunch of cytosine molecules. Avery Thompson, Popular Mechanics, "Scientists Discover That the Double Helix Isn't the Only DNA Form," 24 Apr. 2018 Tobacco Doctors already knew that tobacco could cause cancer, but Alexandrov’s work showed how—by preferentially mutating certain bases (such as cytosine) into others (adenine). Jacqueline Detwiler, Popular Mechanics, "One Guy With a Supercomputer Who's Chasing the Causes of Cancer," 19 Mar. 2018 The bases are often referred to as A, C, G and T, the initials of their full chemical names, adenine, cytosine, guanine and thymine. The Economist, "BiotechnologyGene editing takes another step forward," 26 Oct. 2017 The nascent technology converts the 1s and 0s of computing’s binary code into A, C, G and T, the letters that correspond to DNA base types, adenine, cytosine, guanine and thymine. Jay Greene, WSJ, "Malware Stored in Synthetic DNA Can Take Over a PC, Researchers Find," 10 Aug. 2017 The vast chains of DNA in each cell are made of just four molecules — adenine, guanine, thymine and cytosine — arranged in enormously varied configurations. Gina Kolata, The Seattle Times, "Who needs hard drives? Scientists store film clip in DNA," 12 July 2017 The vast chains of DNA in each cell are made of just four molecules — adenine, guanine, thymine and cytosine — arranged in enormously varied configurations. Gina Kolata, New York Times, "Who Needs Hard Drives? Scientists Store Film Clip in DNA," 12 July 2017

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'cytosine.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of cytosine

1894, in the meaning defined above

History and Etymology for cytosine

International Scientific Vocabulary cyt- + -ose + -ine entry 2

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Time Traveler for cytosine

The first known use of cytosine was in 1894

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More Definitions for cytosine

cytosine

noun
cy·​to·​sine | \ˈsīt-ə-ˌsēn \

Medical Definition of cytosine 

: a pyrimidine base C4H5N3O that codes genetic information in the polynucleotide chain of DNA or RNA — compare adenine, guanine, thymine, uracil

More from Merriam-Webster on cytosine

Britannica.com: Encyclopedia article about cytosine

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