Thymine is one of the pyrimidine bases found in the nucleic acid of deoxyribonucleic acid (DNA), along with adenine, guanine, and cytosine (A, G, and C, respectively). These bases are the building blocks of DNA and all life forms on earth.

Is thymine present in tRNA?

Note that thymine (=5-methyl uracil), which is normally only found in DNA, is also found in the TψC-loop of tRNA, where it is attached to ribose and is made by methylation of uracil after transcription. In addition to uracil, guanine, adenine, and cytosine may also be modified by methylation.

Can thymine be found in RNA?

Adenine and guanine are found in RNA and DNA in terrestrial life, whereas thymine is only found in DNA and uracil only in RNA.