Which of the following lacks membrane ?
Viruses
The correct answer is option 4 I.e. Viruses.
Viruses lack a cell membrane (or plasma membrane).
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Viruses are non-cellular infectious agents.
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They consist mainly of genetic material (DNA or RNA) enclosed in a protein coat (capsid).
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Some viruses have an outer lipid envelope, but this is not a true cell membrane, and not all viruses have it.
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Since they do not have a full cell structure, they lack organelles and a true membrane like living cells.
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