notes on viruses - lee.k12.nc.us · of viruses (does not destroy them) viruses viral diseases are...
TRANSCRIPT
Notes on Viruses What are viruses?● A virus is a __________________particle
made up of genetic material and protein that can invade living cells and reproduce.
● They are ________________(NOT alive).
What are the characteristics of viruses?● With the ability to_________________,
viruses __________ nearly every characteristic of life
● Not composed of cells● Do not respond to stimuli● Do not use energy for growth and development● Need electron microscope to see
How are viruses structured?● ________or
________(retrovirus) surrounded by protective protein coat (capsid)
● Genetic material carries information for _______________
How are diseases caused by viruses?● Cause disease by either
______________or ____________ cells● First ________________itself to a
healthy _____________and then injects its DNA or RNA into cell
● Hijacks (takes over) biochemical machinery of host cell
● Then replicates once __________infected cell
How viruses can be spread● Don’t forget… we already listed in our “Introduction to
Infectious Diseases and Bacteria” notes how disease is spread. Here is a reminder….
● Infectious disease can be spread through:○ Water○ Food ○ ________○ _____________- with object, person, animal○ Body fluids○ Vectors
How do we prevent viruses?● No Cure, just prevention with_______________.● What are vaccines?
○ Vaccines: a substance introduced into the body to stimulate the production of chemicals that destroy specific viruses
● Cannot use antibiotics. Antibiotics are used to treat bacteria
● Vaccinations ________________viruses.● Some anti-viral drugs are used to inhibit the development
of viruses (does not destroy them)
Viruses● Viral diseases are among the most
__________________illnesses in humans. ● These illnesses range from mild __________to
some forms of cancer and include several other severe and __________diseases.
Diseases caused by virusesExamples:
● Influenza (the_________)● Common ___________● Polio● Rabies● West Nile Virus● ______________● Measles