VIRAL STRUCTURE - VIRALSTRUCTURE . . NUCLEICACID ,eithe

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VIRAL STRUCTURE A virion is a compete virus particle. It consists of a nucleic acid surrounded by a protein coat,  which protects the nucleic acid and aids in transmission. The structure of the outer coat may be  used in classification.      NUCLEIC ACID Viruses contain only one kind of nucleic acid, either RNA or DNA.  To make things confusing,  however, this nucleic acid may not be exactly the same in structure as the nucleic acid of cells. In  viruses, RNA is not always single-stranded; it may be a double strand. DNA is not always  double-stranded; it may be a single strand. The nucleic acid may be linear or circular, or even is  several segments. The amount varies from a few thousand nucleotides up to 250,000 nucleotides. GENERAL MORPHOLOGY Based on the plan of their capsids, viruses are placed in several categories:    1. Helical viruses---these are like rods and may be rigid or flexible. The capsid  has a helical 
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This note was uploaded on 01/23/2012 for the course MCB MCB2010 taught by Professor Smith during the Fall '09 term at Broward College.

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VIRAL STRUCTURE - VIRALSTRUCTURE . . NUCLEICACID ,eithe

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