Salma Ahmed
English Lit. GCSE Student
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Genetics Assignment
- Words:
- 4660
- Submitted:
- Sat Aug 22 2009
- Mark submitted by Author:
Have a little read: ... Anatomy & Physiology Genetics TASK 1 DNA is a nucleic acid formed from nucleotides. Individual nucleotides are comprised of three parts: a. Phosphoric acid (Phosphate H3PO4). This has the same structure in all nucleotides. b. Pentose sugar: These are of two types - Ribose (which occurs in RNA) and Deoxyribose (which occurs in DNA). c. Organic bases: There are four different bases which are divided into two groups - Pyrimidines - these are single rings with six sides, are cytosine and thymine in DNA. Purines - these are double rings comprising a six-sided and a five-sided ring, are adenine and guanine in DNA. The three components are combined by condensation reactions to give a nucleotide. By a similar condensation reaction between the sugar and phosphate groups of two nucleotides, a dinucleotide is formed. Continued condensation reactions lead to the formation of a polynucleotide. DNA is a double stranded polymer made up of two polynucleotide chains (known as a Double
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