To analyze:
The ratio of purine to pyrimidine for the given set of ribonucleic acid (RNA), observation of a pattern, and the relation of this pattern to the RNA structure.
Given:
The composition of RNA is different in different organisms. The composition of RNA bases in some organisms is tabulated in Table 1 below:
Table 1: The composition of RNA bases in some organisms
Organism and the tissue from which RNA is extracted |
The composition of RNA base (%) | |||
Adenine | Guanine | Cytosine | Uracil | |
Rat liver | 19.2 | 28.5 | 27.5 | 24.8 |
Carp muscle | 16.4 | 34.4 | 31.1 | 18.1 |
Yeast | 25.1 | 30.2 | 20.1 | 24.6 |
Rabbit liver | 25.1 | 30.2 | 20.1 | 24.6 |
Cat brain | 19.7 | 26.8 | 25.8 | 27.6 |
Introduction:
The pyrimidines are heterocyclic compounds, which mean that there are more than two types of atoms in its cyclic structure. The pyrimidines contain a single ring system. The purines are also heterocyclic compounds but they contain a double ring system in which an imidazole ring (a five membered ring having nitrogen and hydrogen atoms) is attached to the pyrimidine ring.
The RNA consists of two types of purines that are, adenine (A) and guanine (G), and two types of pyrimidines that are, uracil (U) and cytosine (C). The RNA contains ribose sugar (presence of –OH at second carbon) instead of deoxyribose sugar (presence of –H at second carbon), and uracil is present as a base instead of thymine. Thymine is also called as the 5-methyl-uracil.
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Life: The Science of Biology
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