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Question

Which of the following is NOT true about viruses?
  1. Viruses have either DNA or RNA as the genetic material.
  2. Viruses do not infect bacteria, fungi and algae.
  3. Viruses use host machinery to produce more of their kind.
  4. Viruses are useful in the preparation of vaccines.


Solution

The correct option is B Viruses do not infect bacteria, fungi and algae.
Viruses are microscopic organisms that come alive only when inside a host organism (they reproduce only inside another organism). The host organism could be a bacterium, plant or animal. Viruses have either RNA or DNA as their genetic material and are useful in the preparation of vaccines like in case of chicken pox and small pox.
Bacteriophage are the viruses which infect bacteria.

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