Cell Cycle and Cell DivisionMedium
Question
Which is correct about cell theory in view of current status of our knowledge about cell struc ture ?
Options
A.It needs modification due to discovery of subcellular strctures like chloroplasts and mitochondria
B.Modified cell theory means that all living beings are composed of cells capable of reproducing
C.Cell theory does not hold good because all living being do not have cellular organisation (eg, viruses)
D.Cell theory means that all living objects consist of cells whether or not capable of
Solution
Cell theory proposed by ‘Schleiden and Schwann’ states that all living organisms whether animal or plants are made up of cells and have similar organisation. It is the unit of structure and function. Excption to cell theory are the viruses, mycoplasma, viroids, bacteria which are acellular organisms, ie, lacks cellular organisations. Moreover, coenocytic forms like Parame cium, Rhizopus, have more than one nuclei and are exception to cell theory.
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