Purines and pyrimidines are two of the building blocks of nucleic acids. Only two purines and three pyrimidines occur widely in nucleic acids. Here are their structures in organic chemists' line notation: The Purines Adenine Guanine The Pyrimidines Cytosine Thymine Uracil.urines and pyrimidines are two of the building blocks of nucleic acids. Only two purines and three pyrimidines occur widely in nucleic acids. Here are their structures in organic chemists' line notation: The Purines Adenine Guanine The Pyrimidines Cytosine Thymine Uracil.
The Irish flag was introduced by Thomas Francis Meagher in 1848. The green represents the Irish people, most of whom most are Catholic. The orange color represents the British supporters of William of Orange who settled in Northern Ireland in the 17th century most of whom are Protestant.The white in the center represents the peace between the two groups.he green represents the Irish people, most of whom most are Catholic. The orange color represents the British supporters of William of Orange who settled in Northern Ireland in the 17th century most of whom are Protestant. The white in the center represents the peace between the two groups.
Description: This flag represents one of the four provinces of Ireland, Leinster, whose capital is Dublin. The flag was previously used by the United Irishmen in 1798, Daniel O'Connel's Repeal of the Union campaign in the 1830s and 1840s, and the Irish Republican Brotherhood (IRB).