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Miniature but deadly.. find out some interesting information about these particles on the border between the living and the non-living world!
Viruses are so small that you need a special light microscopе to observe most of them.
How do viruses reproduce?
By forcing other cells to produce copies of them
By transforming other cells into viruses
By cell division
In virology, what does the term "vector" refer to?
A virus that does not parasite on cells but lives independently
An organism that carries a virus but is not infected by it
An organism infected by a virus
A virus that spreads through the air
Bacteriophages are organisms that have the characteristics of both viruses and bacteria.
Virus fossils from several thousand years ago show what about the origin of viruses?
They evolved from bits of DNA that "escaped" from cells of organisms.
None of these
They were once small cells that lived parasitically on bigger ones.
They appeared and evolved simultaneously with life on Earth.
When infected by a virus, the bodies of animals and humans start producing a special hormone - interferon. How does interferon help the organism fight virus infections?
By stimulating it to produce antibodies
By boosting the production of white blood cells
By releasing in the body acids fatal for the viruses
By killing the infected cells and their neighbouring cells
Which of the following is not one of the defense mechanisms against viruses in humans?
Acid nature of the stomach contents
The resistance (R) gene
Production of antibodies
Antibiotics are used to treat virus infections in animals and humans but are ineffective in plant virus infections.
Which stage of the virus life-cycle restricts it to infecting only a certain species (or group) of organisms?
Release of viral particles
Attachment to host
Replication of the viral DNA or RNA
Assembly of viral particles
Which of these is not one of the methods used by viruses to make the host cell release the newly produced viruses?
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