what is a virus???. viruses #1: viruses possess genetic material (dna or rna)

of 26 /26
What is a Virus???

Author: rylan-knee

Post on 16-Dec-2015

218 views

Category:

Documents


2 download

Embed Size (px)

TRANSCRIPT

  • Slide 1
  • What is a Virus???
  • Slide 2
  • Viruses
  • Slide 3
  • #1: Viruses possess genetic material (DNA or RNA)
  • Slide 4
  • #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.
  • Slide 5
  • #3: Viruses are not considered to be cells
  • Slide 6
  • Virus Bacteria Fungus
  • Slide 7
  • Structure of a virus
  • Slide 8
  • How big is a Virus?
  • Slide 9
  • Diversity of Viral Structure RodCircularPolyhedral Bacteriophage
  • Slide 10
  • Viral Life Cycle: Lytic Summary: viral DNA mRNA Protein Virus will use the host cell to make proteins needed to create more viruses.
  • Slide 11
  • a. Virus approaches a specific cell to infect b. Virus attaches to the host cell Host Cell Virus c. Virus injects its DNA into the host cell d. Host cells organelles start reading the viral DNA. It has the recipe to destroy the host cell DNA and how to make more viral parts e. Viral assembly. All the created viral parts come together to form new viruses f. The host cell is destroyed or lysed. New viruses set out to find new cells to repeat the process
  • Slide 12
  • Lytic cycle Animation
  • Slide 13
  • The Lytic Cycle occurs. FAST!!!!!
  • Slide 14
  • Example: Influenza Transmission: Air
  • Slide 15
  • Slide 16
  • 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
  • Slide 17
  • Slide 18
  • Slide 19
  • 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
  • Slide 20
  • a. Virus approaches a specific cell to infect b. Virus attaches to the host cell and injects its DNA into the host cell Host Cell Virus c. Viral DNA approaches the host cell DNA d. Viral DNA becomes apart of the host cell DNA e. The viral DNA and host cell DNA is copied every time a new cell is created. f. Stress causes the viral DNA to pop out of the host cell DNA. The lytic cycle begins: more viral parts are created, assembled, and then the host cell is destroyed Viral DNA
  • Slide 21
  • Lysogenic cycle Animation The Lysogenic Cycle occurs.... SLOW!!!!
  • Slide 22
  • Example: Shingles The chickenpox virus remains dormant (not used) for years. Environmental pressure or extreme stress can cause the virus to switch in to the lytic cycle. Raise your hand if you have had chicken pox??? Raise your hand if you think you could you get it again??? Yes.you could get SHINGLES.
  • Slide 23
  • Slide 24
  • Slide 25
  • 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.
  • Slide 26
  • Type 1 HSV: Oral Herpes causes cold sores and sometimes genital herpes. Type 1 Herpes virus infects more than half of the U.S. population by the time they reach their 20s Two types of Herpes Simplex Virus Type 2 HSV: Genital Herpes