Deoxyribosenucleic Acid - DNA

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Deoxyribosenucleic Acid - DNA Nucleic Acids History of Nucleic Acids Genetic Material of Organisms Structure of DNA Nucleosides and Nucleotides Nucleosides of RNA and DNA Ribonucleosides and Ribonucleotides Deoxyribonucleosides and Deoxyribonucleotides Unusual Bases in DNA

Deoxyribosenucleic Acid - DNA

Deoxyribosenucleic Acid - DNA - DNA is present in the cells of all plants, animals, prokaryotes and in a number of viruses. In eukaryotes it is combined with proteins to form nucleoproteins. In prokaryotes (e.g. Escherichia coli, a bacterium) the genetic material consists of a single giant molecule of DNA about 1,000 microns in length, without any associated proteins. DNA is present mainly in the chromosomes. It has also been reported in cytoplasmic organelles like mitochondria and chloroplasts.

The DNA of all plants and animals and many viruses (polyoma virus, small pox virus, bacteriophages T2, T4 and T6) is double stranded. In the bacteriophage ØX174, however, it is single stranded. In some viruses the genetic material is RNA. In the tobacco mosaic virus (TMV), A tobacco virus, influenza virus, poliomyelitics virus and the bacterial viruses F2 and R17 the RNA is single stranded. In the reovirus and the wound tumour virus, however, RNA is double stranded. In bacteria and in higher plants and animals both DNA and RNA are present. Viruses usually contain either DNA or RNA

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Single Stranded DNA Localization of Nucleic Acids Forms of DNA Characteristics of Different Forms of DNA RL Helix and Z-DNA Palindromic DNA Repetitive DNA (Satellite DNA) Satellite DNA of Drosophila Virilis

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