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Viruses

written by: eyez2k1ss
 
Miniature but deadly.. find out some interesting information about these particles on the border between the living and the non-living world!

Question 1:


Viruses are so small that you need a special light microscopŠµ to observe most of them.
True
False

Question 2:


How do viruses reproduce?
By cell division
By maitng
By transforming other cells into viruses
By forcing other cells to produce copies of them

Question 3:


In virology, what does the term "vector" refer to?
An organism infected by a virus
An organism that carries a virus but is not infected by it
A virus that spreads through the air
A virus that does not parasite on cells but lives independently

Question 4:


Bacteriophages are organisms that have the characteristics of both viruses and bacteria.
False
True

Question 5:


Virus fossils from several thousand years ago show what about the origin of viruses?
They appeared and evolved simultaneously with life on Earth.
They evolved from bits of DNA that "escaped" from cells of organisms.
They were once small cells that lived parasitically on bigger ones.
None of these

Question 6:


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 boosting the production of white blood cells
By stimulating it to produce antibodies
By releasing in the body acids fatal for the viruses
By killing the infected cells and their neighbouring cells

Question 7:


Which of the following is not one of the defense mechanisms against viruses in humans?
RNA interference
Production of antibodies
The resistance (R) gene
Acid nature of the stomach contents

Question 8:


Antibiotics are used to treat virus infections in animals and humans but are ineffective in plant virus infections.
False
True

Question 9:


Which stage of the virus life-cycle restricts it to infecting only a certain species (or group) of organisms?
Release of viral particles
Assembly of viral particles
Attachment to host
Replication of the viral DNA or RNA

Question 10:


Which of these is not one of the methods used by viruses to make the host cell release the newly produced viruses?
Lysis
Virosis
Apoptosis
Budding

 


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