Viruses
In the simplest capsid, there is a capsomere at each of the 12 vertices; this capsomere, which is surrounded by five other capsomeres, is termed a

icosahedral
helical
polyhedra
penton

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Viruses
Which of the following statements is not true of viruses?

Viruses probably arose from small fragments of cellular chromosomes
Viruses have been successfully grown in pure cultures in test tubes
All viruses have either DNA or RNA as their genetic material
All viruses are obligatory intracellular parasites

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