chapter 211 viruses - frogstudy.com
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Chapter 211 Viruses
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AIDS
TuberculosisSyphilis
Influenza
Chickenpox
Botulism
Bubonic plague
Polio
Mumps
Lyme disease
Strep throatCommon cold
Which are diseases caused by viruses and which bacteria?
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Are viruses living?
We know.....
All living things are made of cells, able to grow and reproduce, and guided by their DNA.
So its seems like yes, BUT
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They need cells to do these things so scientists do not consider them living.
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_________‐ segments of nucleic acids contained in a protein coat.
Range from 20nm to 250nm.
Only been seen with an __________ microscope.
http://htwins.net/scale2/
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What was one of the main plants in the south around the 1800’s?
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Tobacco
Scientists were trying figure out what was causing a ________ that stunted the tobacco plant growth. They knew it was something smaller than a ____________.
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They were thought to be tiny cells until______ when they purified the virus. They then thought it was a___________ not a cell.
They called is a virus because that is the Latin word that means ________.
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________ ‐ protein coat contain either RNA or DNA.
________ ‐ a membrane that surrounds the capsid in some viruses.
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Helical
Polyhedral
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Bacteriophage‐ viruses that infect ________; This is a polyhedron _______ with a helical tail
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Viruses Replicate inside Living Cells.
They must rely on a host because they cannot metabolize or make _______
In order for a _______ to replicate it must first infect a cell.
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Lytic CycleWhen a virus enters cells it does not always _______ a cell.
After it replaced several hundred times then the cell _______ and is destroyed.
If enough tissue is damaged it can affect an _______.
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Lysogenic cycle‐ some viruses do not make new ________ but insert their DNA into the host cells______ (provirus)
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Viruses like to cold hide in the ______ of the face and then when something happens like _______ the virus starts to cause tissue damage like a cold sore or a fever blister.
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Flu epidemic of 1918
http://en.wikipedia.org/wiki/1918_flu_pandemic
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