A) bacteriophage
B) virus with a single-stranded RNA
C) virus with a single-stranded DNA
D) virus with double-stranded DNA
Correct Answer: B
Solution :
Poliomyelitis is caused by infection with a member of the genus Enterovirus known as poliovirus. This group of RNA viruses prefers to inhabit the gastrointestinal tract. Polio virus infects and causes disease in human alone. Its structure is very simple, composed of single stranded RNA genome enclosed in a protein shell called capsid.
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