- Is Polo a virus?
- Are viruses living?
- What does polio virus look like?
- Are most viruses RNA or DNA?
- Are viruses created?
- What is DNA virus and RNA virus?
- Where does the polio virus come from?
- Did the polio virus come from animals?
- Is polio man made?
- Can viruses reproduce on their own?
- Do viruses have a metabolism?
- What viruses are DNA viruses?
- Do people still get polio?
- Which viruses are RNA viruses?
- Do viruses have double stranded DNA?
Is Polo a virus?
Polio, or poliomyelitis, is a disabling and life-threatening disease caused by the poliovirus.
The virus spreads from person to person and can infect a person’s spinal cord, causing paralysis (can’t move parts of the body)..
Are viruses living?
So were they ever alive? Most biologists say no. Viruses are not made out of cells, they can’t keep themselves in a stable state, they don’t grow, and they can’t make their own energy. Even though they definitely replicate and adapt to their environment, viruses are more like androids than real living organisms.
What does polio virus look like?
The viral particle is about 30 nm in diameter with icosahedral symmetry. Because of its short genome and its simple composition—only RNA and a nonenveloped icosahedral protein coat that encapsulates it, poliovirus is widely regarded as the simplest significant virus.
Are most viruses RNA or DNA?
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.
Are viruses created?
These studies have shown us that viruses do not have a single origin; that is, they did not all arise from one single virus that changed and evolved into all the viruses we know today. Viruses probably have a number of independent origins, almost certainly at different times.
What is DNA virus and RNA virus?
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. ssRNA viruses can be further grouped as positive‐sense (ssRNA(+)) or negative‐sense (ssRNA(−)).
Where does the polio virus come from?
Causes. Share on Pinterest Polio is caused by the poliovirus. The polio virus usually enters the environment in the feces of someone who is infected. In areas with poor sanitation, the virus easily spreads from feces into the water supply, or, by touch, into food.
Did the polio virus come from animals?
Polio was known to be an infectious disease since Karl Landsteiner and Erwin Popper’s famous experiments in 1908 showed that polio could be transmitted between animals. It is transmitted from human to human, typically through drinking water contaminated with faeces containing the virus.
Is polio man made?
The creation of the man-made polio virus came just a month after the World Health Organization had declared polio eradicated from Europe and projected total eradication of the disease by 2005. Last year, only 480 cases were reported in the world.
Can viruses reproduce on their own?
How do viruses multiply? Due to their simple structure, viruses cannot move or even reproduce without the help of an unwitting host cell.
Do viruses have a metabolism?
Viruses are non-living entities and as such do not inherently have their own metabolism. However, within the last decade, it has become clear that viruses dramatically modify cellular metabolism upon entry into a cell. Viruses have likely evolved to induce metabolic pathways for multiple ends.
What viruses are DNA viruses?
DNA viruses comprise important pathogens such as herpesviruses, smallpox viruses, adenoviruses, and papillomaviruses, among many others.
Do people still get polio?
Polio does still exist, although polio cases have decreased by over 99% since 1988, from an estimated more than 350 000 cases to 22 reported cases in 2017. This reduction is the result of the global effort to eradicate the disease.
Which viruses are RNA viruses?
1.1. RNA Viruses. Human diseases causing RNA viruses include Orthomyxoviruses, Hepatitis C Virus (HCV), Ebola disease, SARS, influenza, polio measles and retrovirus including adult Human T-cell lymphotropic virus type 1 (HTLV-1) and human immunodeficiency virus (HIV).
Do viruses have double stranded DNA?
Herpesviruses and Poxviruses Many animal viruses use double-stranded DNA for their genomes. Herpesvirus is a simple virus that has a protein coat and outer envelope surrounding the double-stranded DNA genome. Poxvirus has two envelope layers. A protein layer, known as the palisade, is embedded within the core envelope.