What is thymine?

Thymine is a nitrogen base seen in DNAs.

Nuclear acids are made of Nucleotides. These nucleotides have three major parts:
A pentose monosaccharide
A phosphate group
A nitrogen base group
There are four types of nitrogen bases:
Adenine
Thymine
Cytosine
Guanine
From these four nitrogen base groups, Adenine and Guanine are called Purines and Thymine and Cytosine are called Pyrimidine.

There are two polynucleotide chains in a DNA and they are connected by the Hydrogen Bonds between these four Nitrogen Bases. Here Adenine and Thymine create 2 H bonds between them( and cytosine and guanine makes three H bonds between them).
In RNA. the other nuclear acid form, there are no Thymine and instead of that there is a nitrogen base called Uracil.

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