Wirus – Viruses: What are they and what do they do?

Wirus

Jun 21, 2020 · This page was last edited on 21 June 2020, at 05:43. Files are available under licenses specified on their description page. All structured data from the file and property namespaces is available under the Creative Commons CC0 License; all unstructured text is available under the Creative Commons Attribution-ShareAlike License; additional terms may apply.

Effects of viruses can range from life-threatening to virtually symptomless. Before entering a cell, viruses exist in a form known as virions. During this phase, they are roughly one-hundredth the size of a bacterium and consist of two or three distinct parts: genetic material, either DNA or RNA a protein coat, or capsid, which protects the genetic information a lipid envelope is sometimes present around the protein coat when the virus is outside of the cell Viruses do not contain a ribosome, so they cannot make proteins.

This makes them totally dependent on their host. They are the only type of microorganism that cannot reproduce without a host cell. It is this process that earns viruses the classification of parasite. Viruses have different shapes and sizes, and they can be categorized by their shapes. These may be: Helical: The tobacco mosaic virus has a helix shape. Envelope: Some viruses cover themselves with a modified section of cell membrane, creating a protective lipid envelope.

These include the influenza virus and HIV. Other shapes are possible, including nonstandard shapes that combine both helical and icosahedral forms. Viruses do not leave fossil remains, so they are difficult to trace through time. Three competing theories try to explain the origin of viruses. Regressive, or reduction hypothesis: Viruses started as independent organisms that became parasites. Over time, they shed genes that did not help them parasitize, and they became entirely dependent on the cells they inhabit.

In this way, they gained the ability to become independent and move between cells. Virus-first hypothesis: Viruses evolved from complex molecules of nucleic acid and proteins either before or at the same time as the first cells appeared on Earth, billions of years ago A virus exists only to reproduce.

When it reproduces, its offspring spread to new cells and new hosts. The makeup of a virus affects its ability to spread. Viruses may transmit from person to person, and from mother to child during pregnancy or delivery.

The object is known as a fomite. As the virus replicates in the body, it starts to affect the host. After a period known as the incubation period, symptoms may start to show. What happens if viruses change? This can have long-term effects on a person. In humans, it may explain the development of hemophilia and muscular dystrophy.

This interaction with host DNA can also cause viruses to change. Some viruses only affect one type of being, say, birds. This is why scientists are concerned about rare viruses that spread from animals to people.

Viruses cause many human diseases. These include:.

Coronavirus can live in your body for up to 37 days …

Mar 12, 2020 · Coronavirus can live in your body for up to 37 days, according to new study. By Christina Capatides March 12, 2020 / 7:38 PM / CBS News

https://www.cbsnews.com/news/coronavirus-can-live-in-your-body-for-up-to-37-days-according-to-new-study/

What Are Viruses? Live Science

Wirus

This digitally-colorized image shows the H1N1 influenza virus under a transmission electron microscope. In 2009, this virus (then called the swine flu) caused a pandemic, and is thought to have …

https://www.livescience.com/53272-what-is-a-virus.html

Category:Viruses – Wikimedia Commons

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https://commons.wikimedia.org/wiki/Category:Viruses

The Strain (TV Series 2014–2017) – IMDb

Jul 13, 2014 · Created by Guillermo del Toro, Chuck Hogan. With Corey Stoll, David Bradley, Kevin Durand, Jonathan Hyde. A mysterious viral outbreak with hallmarks of an ancient and evil strain of vampirism ravages the city of New York.

https://www.imdb.com/title/tt2654620/

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Viruses: What are they and what do they do?

May 30, 2017 · Viruses are likely the most abundant organisms on Earth. They exist in almost every environment, and they can infect animals, plants, fungi, and …

https://www.medicalnewstoday.com/articles/158179

WIRUS – Translation in English – bab.la

Jakkolwiek wirus wścieklizny i atenuowany wirus szczepionkowy nie kumulują się zwykle w narządach płciowych oraz nie jest znane bezpośrednie ich oddziaływanie na funkcje rozrodcze. However rabies virus and attenuated rabies vaccine viruses do not usually accumulate in reproductive organs and are not known to directly affect reproductive …

https://en.bab.la/dictionary/polish-english/wirus

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