Does an RNA virus have DNA?
Viral families are grouped based on their type of nucleic acid as genetic material, DNA or RNA 6. DNA viruses contain usually double‐stranded DNA (dsDNA) and rarely single‐stranded DNA (ssDNA). These viruses replicate using DNA‐dependent DNA polymerase. RNA viruses have typically ssRNA, but may also contain dsRNA.
Which virus has no RNA genome?
Retroviruses (Group VI) have a single-stranded RNA genome but, in general, are not considered RNA viruses because they use DNA intermediates to replicate.
Why do RNA viruses have small genomes?
The small size of RNA virus genomes (2-to-32 kb) has been attributed to high mutation rates during replication, which is thought to lack proof-reading.
Which viruses have the biggest genomes?
The biggest known viruses are Mimivirus (750 nanometer capsid, 1.2 million base pair DNA) and Megavirus (680 nanometer capsid, 1.3 million base pair DNA). These giant viruses have all been isolated from environmental samples, and many infect amoebae.
Which virus has both DNA and RNA?
Lenko virus (a Retro virus) possess both DNA & RNA in life cycle.
Do all viruses have RNA?
Most viruses have either RNA or DNA as their genetic material. The nucleic acid may be single- or double-stranded. The entire infectious virus particle, called a virion, consists of the nucleic acid and an outer shell of protein. The simplest viruses contain only enough RNA or DNA to encode four proteins.
Is polio an RNA virus?
Poliovirus, the prototypical picornavirus and causative agent of poliomyelitis, is a nonenveloped virus with a single-stranded RNA genome of positive polarity. The virion consists of an icosahedral protein shell, composed of four capsid proteins (VP1, VP2, VP3, and VP4), which encapsidates the RNA genome (1).
Is Influenza an RNA virus?
Coronaviruses and influenza viruses are both enveloped, single-stranded RNA viruses, and both are encapsidated by nucleoprotein. However, the genomes of these 2 viruses differ in polarity and segmentation. Influenza virus is comprised of 8 single-stranded, negative-sense, viral RNA segments.