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VIRUSES
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WHAT IS A VIRUS?
Virus: a tiny, nonliving
particle that invades and then
multiplies inside a living cell• Act like a parasite that can
only reproduce inside living cells
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ARE VIRUSES ALIVE?
Viruses are not made of
cells, so they are not
alive.
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MADE OF 2 PARTS
1. Protein Coat
2. Genetic Material• DNA or RNA
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TYPES OF VIRUSES
Active
Hidden
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ACTIVE VIRUSES
Immediately takes
over a cell to make new
viruses
Bursts when there are
so many viruses that
the cell breaks
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HIDDEN VIRUSES“Hide” by becoming part of host DNA
and waits until the conditions are right
At some point, make copies just like
an active virus and then go back into
“hiding”
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DO ANTIBIOTICS WORK?
No! They only can kill
bacteria.
…but vaccines can prevent
viral infections
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VACCINESA vaccine is a substance introduced
into the body to stimulate the
production of antibodies (chemicals)
that destroy specific viruses
Ex: chickenpox vaccine and Flu shot