Viruses & Viruses & Bacteria Bacteria Chapter 17 Chapter 17 Biology 11 Biology 11 Presentation put together by Mandie Presentation put together by Mandie Lynn Walls Lynn Walls What are Viruses A virus is a non-cellular particle made up of genetic material and protein that can invade living cells. T4 Bacteriophage T4 Bacteriophage Herpes Virus Herpes Virus Escherichia Coli Bacterium Escherichia Coli Bacterium E. coli is a bacterium. That is a crude cell, it is not a virus E. coli is a bacterium. That is a crude cell, it is not a virus because viruses are protein containers with DNA cores or because viruses are protein containers with DNA cores or RNA cores. RNA cores. E. Coli and the E. Coli and the Bacteriophage Bacteriophage What it looks like in real life What it looks like in real life The Structure Of a Virus The Structure Of a Virus  Viruses are composed Viruses are composed of a core of nucleic of a core of nucleic acid acid  The Nucleic acid core The Nucleic acid core is surrounded by a is surrounded by a protein coat called a protein coat called a capsid capsid  The Nucleic core is The Nucleic core is either made up of either made up of DNA or RNA but never DNA or RNA but never both both Cycle of Lytic and Lysogenic Cycle of Lytic and Lysogenic Vaccines Vaccines ► Viruses grown on chicken embryos are Viruses grown on chicken embryos are attenuated vaccines attenuated vaccines ► Another type of vaccine is made by heat Another type of vaccine is made by heat killing the virus killing the virus Retrovirus  Change DNA into RNA.  Example of a Retrovirus is HIV . Viruses & Viruses & Bacteria Bacteria Chapter 17 Chapter 17 Biology 11 Biology. That is a crude cell, it is not a virus because viruses are protein containers with DNA cores or because viruses are protein containers with DNA cores or