Transcript Viruses
DO NOW 1. Get out your classification HW 2. List the 7 levels of taxonomic organization from most SPECIFIC to most BROAD. 3. What are the rules for binomial nomenclature? 4. Write the following in the proper format: canis lupus What is a Virus??? Viruses #1: Viruses possess genetic material (DNA or RNA) #2: Viruses cannot survive without a host A host is where it lives (other organisms). If it is not in a host, the virus will die. #3: Viruses are not considered to be cells #3: Viruses are not considered to be cells Bacteria Virus Fungus Structure of a virus How big is a Virus? Diversity of Viral Structure Rod Polyhedral Circular Bacteriophage How do viruses infect people?* Viral Life Cycle: Lytic Summary: viral DNA mRNA Protein Virus will use the host cell to make proteins needed to create more viruses. Host Cell Virus Virus d. a. Host cells f. The host cell is c.organelles Virus Viral attaches assembly. injects approaches b.e. Virus start destroyed oraitsto DNA All the into created the host specific cell to the host cell “reading” the viral “lysed”. New viral cell come infect DNA.parts Itset has the viruses out to together form recipe to to destroy find new cells to new viruses the host DNA repeat thecell process and how to make more viral parts Lytic cycle Animation How Viruses Attach Video The Lytic Cycle occurs…………. FAST!!!!! Example: Influenza Transmission: Air Example: Chicken Pox Occurs through direct contact with someone infected with the chickenpox virus, or through the air from an infected person's coughing or sneezing Viral Life Cycle: Lysogenic viral DNA becomes apart of host cell DNA pops out of host cell DNA due to stress mRNA Protein Viral DNA becomes apart of host cell DNA; When stressed viral DNA will detach itself from host cell DNA and switch to the Lytic cycle Host Cell f.Virus Stress causes the viral DNA to pop b. e.Virus d. The c.ofa. Viral Viral viral Virus attaches DNA DNA DNA to out the host cell and becomes the approaches approaches host hostThe cell apart celllytic DNA the and aof DNA. injects the isspecific host copied host its cell cell DNA cell every DNA DNA tointo cycle begins: more time theainfect host new viral partscell areis created. created, assembled, and then the host cell is destroyed Viral DNA Lysogenic cycle Animation The Lysogenic Cycle occurs.... SLOW!!!! Example: Shingles Raise your hand if you have had pox??? Thechicken chickenpox virus remains dormant (not used) forhand years.if Raise your Environmental you think you pressure or extreme could getthe it stress canyou cause again??? virus to switch in to the lytic cycle. Yes….you could get SHINGLES. Example: Herpes Simplex Transmission: Coming into contact with someone who is infected with the virus. This could include kissing and sex. There is no cure. Two types of Herpes Simplex Virus Type 1 HSV: Oral Herpes – causes cold sores and sometimes genital Type 2 HSV: Genital herpes. Herpes Type 1 Herpes virus infects more than half of the U.S. population by the time they reach their 20s