Viruses
The most complex type of bacterial viruses having hexagonal head, a rigid tail with a contractile sheath and tall fibers is morphologically classified as

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

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

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