Question

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.

Answer 1

Answer: (C)

Cell theory does not hold good because all living beings (e.g., viruses) do not have cellular organisation. Viruses are an exceptions to the cell theory as they are obligate parasites (subcellular in nature). Paramecium, Rhizopus, Vaucheria are some examples which may or may not be exceptions to the theory.