Transcript What is a virus? How does it reproduce?

What is a virus?
Take notes if in red.
Listen and ask
questions about
other colors
• Word of the Day:
• Pathogen= an organism or particle that causes
disease
Virus
• You heard about ebola virus
• You know about the influenza virus and the
AIDS virus.
• Did you know they are also using viruses to
cure cancer and other disease.hg
What is a virus?
Fun Fact: More than 3,000 Polio viruses could
fit end to end - in a straight line - across the
period at the end of this sentence.
Background
• First virus identified in
1892- why so late????
• Millions of different kinds
• Are found everywhere
• Once were thought to be
alive, but in 1935 shown
to be non-living
Viral Diseases
• Hepatitis
• HIV/AIDS
Rabies
Measles
• Meningitis
• Mononucleosis
• West Nile
• Ebola
• Influenza-The Flu
Herpes
Chickenpox
Colds
Characteristics
• Definition of Virus:
• Viruses have a core of nucleic acid (genetic
information) surrounded by a protein coat.
Picture
• Nucleic acid core
(DNA or RNA)
• Protein coat
(capsid)
How do they reproduce?
• Can’t grow or replicate on their own
• but can reproduce in another cell (host cell).
What size are they?
Extremely small – smaller than
bacteria and human cells
Virus Animation
• http://www.youtube.com/watch?v=Rpj0emEG
ShQ
How does a virus attack?
(Level 2/3)
Is a virus alive?
Assignment : Make a virus and
show it attack a cell
• Make 1 virus
• 1 cell- label cell
membrane, nucleus
and cytoplasm
• Virus parts inside the
cell
Bacteriophage Virus