Viruses - Mr. Enns
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Transcript Viruses - Mr. Enns
SCIENCE 8
Chapter 1:
Viruses and Bacteria
OBJECTIVE
By the end of the lesson you should be able to:
Describe how viruses and bacteria infect us
WANTED DEAD OR ALIVE??
Viruses are tiny, non-living particles that can
reproduce ONLY inside a host cell.
Viruses seem to be living because they can infect
us and spread…
….but a virus has no nucleus and no organelles So its not classed as living!
SO WHAT MAKES UP A VIRUS?
DNA (a set of instructions to build a virus)
A protein coat (armor to carry the DNA!)
Common Cold Virus
A famous virus….HIV
Bacteriophage
SO HOW DOES A VIRUS
REPRODUCE?
(GO TO PAGE 34)
BACTERIA
They are living and can reproduce anywhere!! (as
long as there are some nutrients available)
They have a modified cell wall, cell membrane,
DNA and ribosomes
Can be killed by an antibiotic (viruses can’t!)
10 MINUTE RESEARCH!
Choose a bacteria or virus and find out the
following information!