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Virus Structure, Classification, and cycle of infections 

Virus Structure, Classification, and cycle of infections . Nicole tobey , Nicole pilla , mackenzie frusco. Overview. What is a virus and what do they contain?. Particles made up of proteins, nucleic acid and sometimes lipids Feed off living cells, host cells Contain 

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Virus Structure, Classification, and cycle of infections 

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  1. Virus Structure, Classification, and cycle of infections  Nicole tobey, Nicole pilla, mackenziefrusco

  2. Overview

  3. What is a virus and what do they contain? • Particles made up of proteins, nucleic acid and sometimes lipids • Feed off living cells, host cells Contain  • Capsid, a protein layer on the outside of virus  • Genetic material, either RNA or DNA, tells the cell what to do NT

  4. Differences in viruses • Come in different shapes and sizes, and have different structures • Can only infect certain cell types • Plant viruses can only infect plant cells • Animal viruses mainly only infect related species' animal cells • Bacteria viruses can only infect specific types of bacteria cells NT

  5. Are they living?! • Not living Living things require: • To be able to independently reproduce • To be able to grow • React to stimuli  • Obtain energy NT

  6. Both Viruses Living cells NT

  7. Reproduction of  virus • Host cell is needed  • Helps them grow and reproduce  • Depend upon living organisms • Harm organs in the process  NP

  8. Viruses infect what? • Bacteria  • Plant cells • Animal cells • Bacteriophages: viruses that infect Bacteria  NP​

  9. Rna caused viruses Common Cold •  Virus RNA is mistaken for mRNA • Transferred into viral proteins  • Host cells releases virus particles  • New particles infect other cells  NP​

  10. RNA Caused Viruses  HIV (AIDS) • Retrovirus: RNA to DNA • Inserted into host cell • Virus particles destroy immune system  • Can no longer fight infections  NP​

  11. Lytic cycle - STEP ONE : virus injects DNA into bacterium - STEP TWO : viral genes transcribe by host cell  - STEP THREE : Bacterium makes new viral proteins and nucleic acids MF

  12. Lytic cycle - STEP FOUR : Proteins and nucleic acids assemble into new viruses  - STEP FIVE : Viral enzymeslysebacteriums cell wall  • New viruses escapeand infect other bacterial cells MF

  13. Lysogenic cycle • - STEP ONE : Virusinjects DNA into bacterium • - STEO TWO : Viral DNA inserts itself into bacterial chromosome,  this is called prophage  • - STEP THREE : Prophage may replicate with bacterium for many generations  MF

  14. Lysogenic cycle - STEP FOUR :Prophageexit bacterial chromosome and enter lytic cycle - STEP FIVE : Bacterium makes new viral proteins and nucleic acids  - STEP SIX : Proteins and nucleic acids assembleinto new viruses  - STEP SEVEN :  • Viral enzymes lyse bacteriums cell wall • New viruses escape and infect other bacterial cells

  15. MF

  16. Abc's: which is a part of a virus? A. Membrane B. Nucleus C. Capsid D. Golgi Apparatus  C NT

  17. ABc's: which do cells and viruses have in common? A. Reacts to stimuli  B. Needs host cell to reproduce C. Needs parent cell to reproduce  D. Contains DNA D NT

  18. ABC's: A virus can only reproduce... A. asexually  B. Within a host cell C. They don’t need anything, their independent  D. sexually  B NP​

  19. ABC'S: Viruses can infect?  A. Plant cells  B. Animal cells C. Bacteria D. All of above D NP​

  20. ABC's : What does lysogenic have that lytic does not? • A. Viruses can reproduce either infection • B. Host cell is not immediately taken over • C. Bacteriophage DNA that became imbedded in bacterial DNA • D. Proteins and nucleic acids assemble into new viruses A MF

  21. ABC's : What step does lytic have that lysogenic does not ? • A. proteins and nucleic acids assemble into new viruses • B. Viral genes are transcribed  • C. Virus injects DNA into bacterium • D. Bacterium makes new viral proteins and nucleic acids B MF

  22. Overview

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