Which one of the following statements about viruses is correct
A. Nucleic acid of viruses is known as capsidd
B. Viruses possess heir own metabolic system
C. All viruses contain both RNA and DNA
D. Viruses are obligate parasites

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Correct Answer - D
(d) Viruses are non-cellular, obligate parasites. They have DNA or RNA as genetic material (never both). Genetic material of virus is covered in protein coatm known as capsid. Viruses do not contain their own metabolic system after entrance in them.

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