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Which is correct about cell theory in view of current status of our knowledge about cell structure?

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Which is correct about cell theory in view of current status of our knowledge about cell structure?
aIt needs modification due to discovery of sub-cellular structures like chloroplasts and mitochondria
bModified cell theory means that all living being are composed of cells capable of reproducing
cCell theory does not hold good because all living beings (e.g., viruses) do not have cellular organisation
dCell theory means that all living objects consists of cells whether or not capable of reproducing
✓ Correct answer: c) Cell theory does not hold good because all living beings (e.g., viruses) do not have cellular organisation
ExplanationThe correct statement regarding cell theory, given our current knowledge, is: "Cell theory does not hold good because all living beings do not have cellular organization, e.g., viruses".Key points about cell theory: All living organisms are composed of cells.Cells are the basic unit of life.New cells come from pre-existing cells.Viruses are not considered living cells because they lack cellular organization and replicate inside host cells.
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