1 / 22

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 

alisa
Télécharger la présentation

Virus Structure, Classification, and cycle of infections 

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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

More Related