34. Which of the following descriptions of ''virus" is INCORRECT ?
(A) A virus is a small infectious agent that can replicate only inside the living cells of an organism.
(B) A virus is composed of protein coat and nucleic acid.
(C) The genetic material of a virus is either a double-stranded DNA or a single-stranded RNA.
(D) During virus replication, some virus particles may not contain viral genome.
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