The 7th and 8th graders are having a quiz on viruses and bacteria on Monday 11/23/09 and Tuesday 11/24/09. Anyone who's absent can take it when we return from Thanksgiving break. Here's a copy of the Review Sheet:
VIRUSES
What is it? (definition)
Is a virus living? Why not?
Origins of viruses (their evolution)
How a virus invades a cell
How a virus reproduces
How a vaccine works
The two ways in which antibodies can help fight against a viral infection
How a white blood cell helps in the fight against a viral infection
BACTERIA
What is it? (definition)
How bacteria reproduce (duplicates all of its parts and splits into two. This is called FISSION)
Ecological roles of bacteria:
• nitrogen fixers
• other bacteria involved in the nitrogen cycle
• decomposers (produce ammonia!)
• photosynthesizers
• Inside the bodies of animals, where they help digest food, make vitamins,
and perform other vital functions.
• Some bacteria infect other living things and cause disease.
NITROGEN
Why is it important to living things?
Why are most of the world’s living things dependent on bacteria for nitrogen?
What happens to nitrogen when we say it is “fixed”?
What is a “nitrogen-fixing plant”?
Which nitrogen compounds are easily taken up by plants?
Why are we once again in awe of enzymes?
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