Question

Polio virus has
A. ssDNA
B. dsDNA
C. ssRNA
D. dsRNA

Answer 1

It is composed of RNA genome and protein capsid, its genome is positive sense RNA genome which is enclosed within the viral particle and can be used as messenger RNA.

Complete answer:
First of all you should know about the terms given in the question which is about polio virus, ss DNA, ds DNA, ss RNA, ds RNA. So, polio virus is a virus which causes poliomyelitis disease and this disease is life threatening. This virus spreads from person to person which can affect the spinal cord and that can cause paralysis which means that person won't be able to move the body parts. It is composed of RNA genome and a protein capsid and its RNA is single-stranded and this RNA genome is about 7500 nucleotides long. The capsid consists of four structural proteins, VP1, VP2, VP3 and VP4. Humans are the only natural host.

If we look at the options now,

Option A is ssDNA i.e., single stranded DNA. Polio viruses have single stranded RNA not DNA. So, this option cannot be the right one and thus it gets eliminated.

Option B is dsDNA i.e, double stranded DNA. Poliovirus are the single stranded RNA viruses; they do not have DNA, not even ssDNA or dsDNA. Therefore, both the first and second option gets eliminated.

Option C is ssRNA. This option is the correct one as Polio virus is composed of single stranded RNA genome and protein capsid. Therefore, it is the correct option.

Option D is dsRNA i.e., double stranded RNA. Polio virus contains RNA but not the double stranded one and hence this option cannot be the correct one and correct option is C which is ssRNA (single-stranded RNA)

Hence, the correct answer is option (C).

Note: Polio virus spreads from one person to another and polio virus is composed of RNA genome and the protein capsid. Its genome is a single stranded positive-sense RNA genome and there is absence of DNA in the polio virus which makes this virus to have single-stranded RNA.