DNA

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Special addition

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viruses also contain genetic material, that could be either RNA or DNA. No virus contains both RNA and DNA.

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A virus is a nucleoprotein and the genetic material is infectious.

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In general, viruses that infect plants have single stranded RNA and viruses that infect animals have either single or double stranded RNA or double stranded DNA.

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Bacterial viruses or bacteriophages (viruses that infect the bacteria) are usually double stranded DNA viruses

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DNA is a long polymer of deoxyribonucleotides. The length of DNA usually defined as number of nucleotides, is also characteristic of an organism.

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SIDDSIR

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Purines are same in DNA and RNA, cytosine is common to both DNA and RNA, Uracil is present in RNA, Thymine (5-methyl uracil) in DNA

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A nitrogenous base is linked to the OH of 1C pentose sugar through a N-glycosidic linkage to form a NUCLEOSIDE

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When a phosphate group is linked to OH of 5'C of a nucleoside through phosphoester linkage, a corresponding NUCLEOTIDE is formed.

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Two nucleotides are linked through 3'-5' phosphodiester linkage to form a DINUCLEOTIDE.

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More nucleotides in such a manner form polynucleotide.

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DNA

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