|a chain of amino acids linked together by peptide bonds and having a molecular weight of up to about 10,000.|
|a very large molecule, as a colloidal particle, protein, or esp. a polymer, composed of hundreds or thousands of atoms.|
cytosine cy·to·sine (sī'tə-sēn')
A pyrimidine base that is an essential constituent of RNA and DNA.
|cytosine (sī'tə-sēn') Pronunciation Key
A pyrimidine base that is a component of DNA and RNA, forming a base pair with guanine. Chemical formula: C4H5N3O.