Because A, G, C, and T appear in the DNA, these molecules are called DNA-bases; A, G, C, and U are called RNA-bases. Uracil and thymine are identical except that uracil lacks the 5' methyl group. Adenine and guanine belong to the double-ringed class of molecules called purines (abbreviated as R).
Definition of decalcomania. 1  1 : the art or process of transferring pictures and designs from specially prepared paper (as to glass) 2  2 : decal.
Shelly Winters wrote of cockamamie in The New York Times in 1956 that âThis word, translated from the Brooklynese, is the authorized pronunciation of decalcomania. Anyone there who calls a cockamamie a decalcomania is stared at.â. Quite how the word changed sense to mean something incredible is least clear of all. An early sense was of something inferior or second-rate, which presumably referred to the poor quality of the cheap transfers. It might have been influenced by words such as cock-and-bull or poppycock.