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Virus injecting its genetic material into a bacterium.
© Gary E. Kaiser
A single virus particle (virion) is in and of itself essentially inert.

Viruses cannot reproduce or express their genes without the help of a living cell.

Once a virus has "infected" a cell, it will "marshal" the cell's ribosomes, enzymes and much of the cellular machinery to reproduce.

Viral reproduction produces many, many progeny, that when complete, leave the host cell to infect other cells in the organism.

Learn more about viruses, visit:


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(3) Luke says:

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(4) Tekla Jacob says:

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December 3, 2009 at 1:29 pm
(5) samon says:

thanx this is really help with my biology project at school. i’m a 10th grader tryin to figure out weather viruses are real or not. i have so many steps to go through. wish me luck…thanks again

December 8, 2009 at 4:01 am
(6) Seduge Patrick says:

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(7) ilah says:

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February 27, 2010 at 2:28 pm
(8) JAY says:

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June 9, 2010 at 10:47 pm
(11) Cheilsee says:

Well thx lots! i juss needed sexually or asexually

September 1, 2010 at 10:57 pm
(12) Scav says:

Wait a second, so a virus eats up a cell to reproduce, when the cell is empty it moves in another one until there are no cells left and you die?
It reminds me of human species as if the planet is a living organism and we are the virus…

December 17, 2010 at 12:12 pm
(13) Marzan says:

Luke you an me are the same

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(14) ward says:

this stinks

February 28, 2011 at 5:38 am
(15) Joshua says:

Thank u ^_^

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Turn around.

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(17) Thomas says:

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(26) Bob says:

Thanks alot

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January 8, 2013 at 9:06 pm
(31) Bob Stoops says:

Thank you, but I think I need a little more.

June 1, 2013 at 6:31 am
(32) www.teenspot.com says:

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June 3, 2013 at 9:23 pm
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August 4, 2013 at 11:17 pm
(34) Ashutosh Singh says:

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January 19, 2014 at 2:38 pm
(35) Nikki says:

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March 21, 2014 at 7:52 am

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