wednesday in pap biology reminders: – you have a vocabulary check today (list 3) – you have a...
TRANSCRIPT
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Wednesday in PAP Biology
• REMINDERS:– You have a vocabulary check today (list 3)– You have a Taxonomy assessment Monday– You have a Virus assessment next Friday, as well as a 4a
review assessment AND vocab check!!! BE READY!
• Today we are:– Finishing/reviewing classification– Taking notes and discussing Viruses – Creating a virus poster
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Virus Poster (using book and notes to complete)
Include all of the following on your poster:1. Structure of a typical animal virus AND bacteriophage,
with labeled structures (capsid, envelope, genetic material, etc)
2. Function of viruses 3. Drawing and description of how viruses reproduce
(both cycles)4. Viruses caused by both Lytic and Lysogenic infections5. Section comparing viruses to prokaryotes
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VirusesBiology 4(C)
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Learning objectives– Know the structure of viruses– Compare viruses to cells– Understand viral reproduction– Understand the role of viruses in
diseases
Viruses
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Do viruses fulfill the characteristics of life? NO– Viruses cannot reproduce on their own
• Need host machinery (ribosomes)
– Viruses cannot metabolize energy• Need host energy
– No, not considered biotic (a living thing)
What is a Virus?
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Capsid – protein shell that protects genetic information of virus
Viral Structure - Bacteriophage
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Genetic information – strands of DNA or RNA used to make viral proteins inside infected hosts
Viral Structure - Bacteriophage
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Tail – protein shaft that contracts to inject viral genetic information into host
Viral Structure - Bacteriophage
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Tail fibers – proteins that attach to the outside of a host
Viral Structure - Bacteriophage
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Membranous envelope – lipids that attach and fuse to hosts
Viral Structure – Other Types
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Viruses• DNA or RNA• Need a host to
replicate• Never contain
organelles• Do not convert
energy
Cellular Life• Only DNA• Can reproduce
independently• Eukaryotes
contain organelles• Convert energy to
perform tasks
Viruses vs. Cellular Life
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• Viruses need a host to reproduce– Goal: create more copies of their genetic material
• Two methods– Lytic Cycle– Lysogenic Cycle
Viral Reproduction
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• Lytic Cycle– Attaches to host– Injects genetic material into host– Cellular machinery duplicates genetic material and creates
viral proteins (capsids, tail fibers)– New viruses are assembled– New viruses exit the cell by bursting the cellular membrane
• End result – more viruses made, cell dies
Viral Reproduction – Lytic Cycle
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Lytic Cycle Attachment
Entry
ReplicationAssembly
Release
Viral Reproduction – Lytic Cycle
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• Lysogenic Cycle– Attaches to host– Injects genetic material into host– Viral genetic material is inserted into host genome– Viral genetic material lies dormant– When cell reproduces, new copies have viral genetic
information– Environmental stimulus sends viral DNA into lytic cycle
• End result – more viral genome made, cell lives
Viral Reproduction – Lysogenic Cycle
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Lysogenic CycleAttachment
Entry
ReproductionInsertion
Separation
Viral Reproduction – Lysogenic Cycle
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Lytic Cycle• New viruses
made• Cellular host dies
Lysogenic Cycle• Genome copies
made• Cellular host lives
Viruses can use both cycles1. Infect many cells with lysogenic2. Create many viruses at once with lytic
Viral Reproduction
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Lysogenic Cycle:– Herpes– HPV– Chicken Pox (can
become shingles)– HIV– Hepatitis B
Lytic:– SARS– Common Cold– Influenza– Rabies– AIDS phase of HIV– Tobacco Mosaic
Virus (in plants)
Common Viral Infections
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Lytic & Lysogenic Cycles
Viral Reproduction
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• AIDS – acquired immune deficiency syndrome– Describes loss of immune system because of HIV
• Caused by HIV - human immunodeficiency virus– makes helper T cells useless
• Prevention– No vaccine– Limit transmission (use condoms)– Avoid transmission (use clean needles)
Viral Diseases - AIDS
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• Influenza (the flu)– Causes fever, fatigue, and respiratory infections– More severe than common cold, can be deadly
Viral Diseases - Influenza
• Caused by a variety of influenza viruses– Change often, new vaccines yearly– Can blend with bird and swine
strains to produce new viruses
• Prevention– Seasonal vaccine– Limit transmission (wash hands)
Image by NIAD [Public Domain]
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• The Common Cold– Causes fever, fatigue, and respiratory infections– Less severe than influenza
• Caused by a variety rhinoviruses– Over 200 different virus strains
• Prevention– No vaccine– Limit transmission
(wash hands)
Viral Diseases – Common Cold
Image by Robin S [GNU]
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• Hepatitis A– Causes inflammation of liver, jaundice appearance– Rarely results in liver failure
• Caused by a hepatitis A virus– Carried through infected food or water
• Prevention– Vaccine– Limit transmission
(wash hands, food)
Viral Diseases – Hepatitis A
Image by The CDC [Public Domain]
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• Some animal viruses exit without lysing the host– Envelopes that fuse to the host cell’s plasma membrane
Viral Reproduction in Animals
Images by Matt Gonda [Public domain]
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Viral Diseases – AIDS – HIV Replication
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Graoh by Jurema Oliveira [GFDL]
Viral Diseases - AIDS
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• Initial infection– Helper T cells rapidly decline– Viral genome rapidly increases
• Clinical latency– Viral genomes lay mostly dormant in infected cells
• AIDS– Rate of viral creation outweighs helper T cell creation
• Death– Immune system too weak to fight common pathogens
Viral Diseases - AIDS