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...Characteristics of viruses may be regarded as exceptionally complex aggregations nonliving chemicals or simple living microbes because are inert outside host cells but once enter a cell they become active and starts multiplication occurs therefore can termed obligatory intracellular parasites contain single type nucleic acid either dna rna protein coat sometimes enclosed by an envelope complete fully developed viral particle composed surrounded is called virion range it refers to the spectrum in which virus multiply specific that infect invertebrates vertebrates plants fungi bacteria most types only one species determined attachment site on surface size measured electron microscopy from nm length structure kind stranded double linear circular capsid each subunits capsomeres several some consisting lipids proteins carbohydrates envelopes covered with carbohydrate complexes spikes morphology basis their architecture helical polyhedral enveloped...