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The nucleic acid of a virus may be

  • A.always circular and always double stranded
  • B.single or double stranded, and linear or circular
  • C.double stranded only
  • D.single stranded only

Answer: B

Correct answer: single or double stranded, and linear or circular

Viruses use every arrangement of nucleic acid found in nature and some found nowhere else: DNA or RNA, single or double stranded, linear, circular or segmented, and in the case of single-stranded RNA either positive or negative sense. No other group of infectious agents shows this variety, and it is one of the reasons virus classification rests on genome type.

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