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Dna - College Paper

Dna

, or Deoxyribonucleic Acid, is described, in Encarta Encyclopedia as a genetic material of all cellular organisms and most viruses. carries the information needed to direct protein synthesis and replication. Protein synthesis is the production of the proteins needed by the cell or virus for its activities and development. Replication is the process by which copies itself for each descendant cell or virus, passing on the information needed for protein synthesis. In most cellular organisms, is organized on chromosomes located in the nucleus of the cell.
A molecule of consists of two chains, strands composed of a large number of nucleotides, that are linked together to form a chain. These ...

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of the adjacent nucleotide in the chain. These linked deoxyribose-phosphate subunits form the side rails of the ladder. The bases face inward toward each other, forming the steps of the ladder.
The nucleotides in one strand have a specific association with the corresponding nucleotides in the other strand. Because of the chemical affinity of the bases, nucleotides containing adenine are always paired with nucleotides containing thymine, and nucleotides containing cytosine are always paired with nucleotides containing guanine. The complementary bases are joined to each other by weak chemical bonds called hydrogen bonds.
carries the instructions for the production of proteins. A protein is composed of smaller molecules called amino acids, and the structure and function of the protein is determined by the sequence of its amino acids. The sequence of amino acids, in turn, is determined by the sequence of nucleotide bases in the . A sequence of three nucleotide bases, called a ...

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PAPER DETAILS

Added: 8/14/2008 09:17:08 PM
Category: Science & Nature
Type: Premium Paper
Words: 977
Pages: 4

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