Q. Which is correct about cell theory in view of current status of our knowledge about cell structure'? 
(a) It needs modification due to discovery of subcellular structures like chloroplasts and mitochondria. 
(b) Modified cell theory means that all living being are composed of cells capable of reproducing. 
(c) Cell theory does not hold good because all living beings (e.g., viruses) do not have cellular organisation. 
(d) Cell theory means that all living objects consists of cells whether or not capable of reproducing. 

Dear student,
Answer: c) Cell theory does not hold good because all living beings do not have cellular organisation.
Viruses are exceptions to the cell theory. They are subcellular structures which are obligate parasites. They can not be considered alive outside a host cell. Virus only consists of genetic material and a protein coat.
Regards.
 

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