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Nucleic Acids
Part 1 of Paper
....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. The two helical polynucleotide chains are coiled around a common axis. The two chains have opposite polarity i.e. they ar.... Part 2 of Paper
..... Deoxyribo contain the sugar deoxyribose. The only difference between these two sugars is that deoxyribose contains one oxygen atom less than ribose. Pentose sugars are essential because they are involved in linking different nucleotides together by condensation reactions.
The Nitrogen-Containing Bases
There are two types of bases found in nucleic acids. The purine bases have two nitrogen containing rings, while the pyrimidines have only one. In DNA the purines are adenine (A) and guanine (G).... |
| Number of words: 425 - Approximate pages: 2 |
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