BACK NEXT WHAT IS A VIRUS BACK NEXT
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WHAT IS A VIRUS? BACK NEXT Introduction – Structure – Replication – Virology – Medicine – Review
VIRUS • It is NOT ALIVE …depends on a host cell to reproduce. BACK NEXT
A VIRUS is either DNA or RNA, that is protected by a protein coat called a CAPSID DNA BACK (protein Coat) VIRUS Introduction – Structure – Replication – Virology – Medicine - Review NEXT
Why are some viruses harmful? Virus invades cell Virus forces cell to make copies of virus When your cells make viruses instead of operating normally, YOU get sick Eventually so many copies are made, the cell explodes, releasing all of the new viruses BACK NEXT Introduction – Structure – Replication – Virology – Medicine - Review
Examples of some viral diseases: DISEASE VIRUSES AIDS HIV Wart Flu Measles Cancer Herpes Simplex Virus Influenza Morbillivirus . Hepatitis B BACK NEXT Introduction – Structure – Replication – Virology – Medicine - Review
Who do viruses infect? Viruses usually infect a specific host including: • Viruses infect Bacteria – These viruses are called bacteriophages • Viruses infect Plants – One example is the Tobacco Mosaic Virus • Viruses infect Animals – One example is the common cold BACK NEXT Introduction – Structure – Replication – Virology – Medicine - Review
Adenoviruses cause diseases like pink-eye or the common cold BACK NEXT Introduction – Structure – Replication – Virology – Medicine - Review
Bacteriophage is a virus that infects bacteria. BACK NEXT Introduction – Structure – Replication – Virology – Medicine - Review
How do viruses replicate? BACK NEXT Introduction – Structure – Replication – Virology – Medicine - Review
Replication Phases I, III - Viruses enter cell - Attachment to cell membrane Penetration inside cell Losing virus protein coat Phase I IV - Replication - Tricks cell into making more viral DNA Tricks cell into making viral protein coat V - Release - - BACK Assembly of virus DNA and protein coat into whole new viruses Leaving the cell Phase III Phase IV Phase V http: //www. cat. cc. md. us/courses/bio 141/lecguide/unit 2/viruses/adlyt. html Introduction – Structure – Replication – Virology – Medicine - Review NEXT
- Viruses How Viruses Multiply • Active viruses enter cells and immediately begin to multiply, leading to the quick death of the invaded cells. BACK NEXT
- Viruses How Viruses Multiply • Hidden viruses “hide” for a while inside host cells before becoming active. BACK NEXT
The End BACK NEXT Introduction – Structure – Replication – Virology – Medicine - Review
- Viruses Deadly Virus • Click the Video button to watch a movie about deadly viruses. BACK NEXT
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