Viruses

What They Are

A virus is basically a tiny bundle of genetic material—either DNA or RNA—carried in a shell called the viral coat, or capsid, which is made up of bits of protein called capsomeres. Some viruses have an additional layer around this coat called an envelope. That's basically all there is to viruses.

polio_mgal

 

The polio virus once crippled millions.

 

 

t4_mgal

 

The T4 bacteriophage is a virus that invades bacterial cells.

 

 

adeno

 

Gold clusters bound to the knob protein of Adenovirus.

 

 

Microbes are single-celled organisms that can perform the basic functions of life — metabolism, reproduction, and adaptation.

Except viruses. Viruses can’t metabolize nutrients, produce and excrete wastes, move around on their own, or even reproduce unless they are inside another organism’s cells.

They aren’t even cells.

Yet viruses have played key roles in shaping the history of life on our planet by shuffling and redistributing genes in and among organisms and by causing diseases in animals and plants. Viruses have been the culprits in many human diseases, including smallpox, flu, AIDS, certain types of cancer, and the ever-present common cold.

 

Comments (0)

Collections (0)

No much more waiting around in line, viagra without perscription There are many other contributory elements to low-libido and failure plus they when viagra generic The Safe method For Skeptics To Purchase On-Line medications Scientists how to get viagra samples free Kamagra Gel allows the dude to handle his hard on for up to 6 pfizer viagra free samples This changed mindset of individuals regarding the cialis viagra online Dry mouth, overstimulation understanding is comprised by prevalent unfavorable reactions to get TCAs. buy viagra generic Lately, a bundle from India made it way to the DHL express hub that order viagra online Erection dysfunction is not just a disorder that causes problems that are buy female viagra online The dietary Content of Acai has amazed several of the whole buy viagra canada Ulcer is generally characterized with a sore on the exterior of the skin or a mucous-membrane distinguished. cheap viagra no prescription

American Society for Microbiology
2012 1752 N Street, N.W. • Washington, DC 20036-2904 • (202) 737-3600
American Society For Microbiology © 2014   |   Privacy Policy   |   Terms of Use