A) All viruses known to man are obligate parasites
B) Some viruses have cellular structure and are saprophytes
C) Viruses are filterable facultative parasites
D) Viruses are capable of performing metabolic activities on their own
Correct Answer: A
Solution :
Viruses are non-cellular, obligate intracellular parasites. They are genetic elements enclosed in protein coat. They cant reproduce independently. The virus particle produces many diseases like influenza, polio, flue, AIDS etc.
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