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Nucleic Acids
Beginning of essay
DNA is the single most important molecule found within cells. It is a stable polynucleotide, which contains coded information for inherited characteristics. It is contained in chromosomes in the nucleus of an eukaryot cell. The essential features of the Watson-Crick model are summarised below.
1. T ....
Middle of essay
....ining rings, while the pyrimidines have only one. In DNA the purines are adenine (A) and guanine (G) and the pyrimidines are cytosine (C) and thymine (T). In RNA the purine bases are the same as in DNA, but the pyrimidines are cytosine and uracil (U). These rings have the chemical property of being bases because of the nitrogen atoms they contain.
Adenine always forms 2 hydrogen bonds with thymine.
Cytosine always forms 3 hydrogen bonds with guanine.
Phosphate Group
The phosphate group gives.... |
| Number of words: 425 |
Approximate pages: 2 |
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