Which of the following statements are false about viruses?
(I) Viruses are facultative parasites.
(II) Viruses can multiply only when they are inside the living cells.
(III) Viruses cannot pass bacterial proof filters.
(IV) Viruses do not contain proteins, DNA and RNA.
Text Solution
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Statement (I): False. Viruses are obligate parasites, not facultative parasites. Obligate parasites must have a host to complete their life cycle, whereas facultative parasites can survive without one.
Statement (II): True. Viruses lack their own metabolic machinery (like ribosomes) and can multiply only by hijacking the living cells of a host.
Statement (III): False. Viruses are submicroscopic and significantly smaller than bacteria; therefore, they can pass through bacterial-proof filters.
Statement (IV): False. Viruses do contain proteins (the protective capsid) and genetic material in the form of DNA or RNA (though never both).
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