Download Viruses so far

Viruses so far...
poison
1. Virus is latin for _________________.
2. What is a virus?
Particles of nucleic acid, protein, and in some cases, lipids. A typical virus is composed of a core of DNA or RNA surrounded by a protein coat (capsid).
3. Are viruses alive? why or why not?
They are not alive (because they are not capable of independent reproduction or metabolism)
4. How do most viruses work?
The virus binds to a specific host cell, injects its DNA, takes over the host cell by tricking it into making more viral parts, viral parts assemble and make many new viruses.
5. What are the two ways in which a virus can reproduce?
1. The Lytic Cycle (infects and affects QUICKLY)
2. The Lysogenic Cycle (Infects, but doesn't affect right away)
http://faculty.ccbcmd.edu/courses/bio141/lecguide/unit3/viruses/lytsum.html
2. The Lysogenic Cycle
Other viruses, including some bacteriophages, cause lysogenic infections.
In the lysogenic cycle, the host cell will make copies of the virus indefinitely. The viral DNA integrates its DNA (prophage) into the DNA of the host cell and the viral genetic information is replicated along with the host cell's DNA. Unlike lytic viruses, lysogenic viruses do not lyse (burst) the cell right away. Instead, a lysogenic virus remains inactive for a period of time.
Eventually, the viral DNA (prophage) will remove itself from the host cell DNA and start the synthesis of the viral particles to make new viruses. http://www.youtube.com/watch?v=FQWCFt9y51U
ADD THIS TO YOUR NOTES:
• Incubation Period – time between the virus infecting and the host cell being affected
• Ex HIV – incubation period 6 mo. to 10yrs+ http://phschool.com/webcodes10/index.cfm?
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More Human Viral Diseases •
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Chicken Pox
Mumps
Herpes
Hepatitis
Warts