Multiple choice

Among the following ---------------- is a DNA pyrimidine nitrogen base.

  1. 5-Hydroxymethylcytosine

  2. hygrine

  3. imazapyr

  4. imidazole

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A Correct answer
Explanation

5-Hydroxymethylcytosine is a DNA pyrimidine nitrogen base. It is formed from the DNA base cytosine by adding a methyl group and then a hydroxy group. It is important in epigenetics because the hydroxymethyl group on the cytosine can possibly switch a gene on and off.