VIRUSES. 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.

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Presentation transcript:

VIRUSES

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

ARE VIRUSES ALIVE?  Viruses are not made of cells, so they are not alive.

MADE OF 2 PARTS  1. Protein Coat  2. Genetic Material DNA or RNA

TYPES OF VIRUSES  Active  Hidden

ACTIVE VIRUSES  Immediately takes over a cell to make new viruses  Bursts when there are so many viruses that the cell breaks

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”

DO ANTIBIOTICS WORK?  No! They only can kill bacteria.  …but vaccines can prevent viral infections

VACCINES  A 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