PPT-Bacterial viruses

Very complex shape requiring 20 gene products for assembly Capsid head contains linear dsDNA genome Tail consists of sheath plus internal tube Bacteriophage T4 Figure 112 Phage T4 binds to . Embryonated. Egg. Viruses do not fall in the category of unicellular . microorganism. They . are obligate intracellular parasites and lack the . machinery . necessary for protein and nucleic acid . synthesis. A . virus. is a small . infectious agent. that can replicate only inside the living cells of organisms. Most viruses are too small to be seen directly with a . microscope. . Viruses infect all types of organisms, from . DNA Enveloped . Viruses. I. Objectives. In this lecture you will learn about properties, pathogenesis, clinical picture and diagnosis of: . Herpesviruses. . (HHVs 1 to 8). Poxviruses. Smallpox Virus. Other . Acellular. Infectious Agents. 1. 6. Copyright © McGraw-Hill Global Education Holdings, LLC. Permission required for reproduction or display.. Acellular. Agents. Viruses . – protein and nucleic acid. 1. A program that attaches itself to another . executable. (a . host program. ). Whenever the host program is executed, virus code is ran and it can make a copy of itself and infect other executables found in your memory or hard drive. What is a Virus?. Very small . Non-living particle. Made up of nucleic acid. . and proteins. Can only reproduce by infecting living cells. Do not carry out respiration, grow or develop. Structure. Viruses have an inner core which contains either RNA or DNA. copyright cmassengale. 2. Are Viruses Living or Non-living?. Viruses are both and neither. They have . some properties of life but not others. For example, viruses can be killed, even crystallized like table salt. HIV infected T-cell. Viral Structure. not . cells. small . infectious particles . w/. DNA or RNA enclosed . in a protein coat . (capsid). in . some cases. , a membranous envelope. Viral Genomes. genomes . Where the name came from. This is a phrase coined from biology to describe a piece of software that behaves very much like a real virus (only it spreads from computer to computer rather than people!).. Chapter 18. Are Viruses Alive?. As a group discuss for 1 minute. Be able to defend your answer for the class!. Are . VIRUSES. alive?. Growth and Development. Reproduce. Change Over Time. Obtain and Use Energy. Embryonated. Egg. Viruses. Viruses do not fall in the category of unicellular . microorganism. They . are obligate intracellular parasites and lack the . machinery . necessary for protein and nucleic acid . VOCABULARY. Virus. Capsid. Envelope. Human . Immunodeficiency Virus (HIV. ). Influenza. Lytic Cycle. Lysogenic Cycle. Lysis. Retrovirus. Prerequisite questions. What are the eight characteristics which all living things have in common. What are the characteristics of viruses? Bacteria? What kingdom do each of these belong? Are they living? Why or why not. ?. What do you already know?. What are the differences between viruses and bacteria?. What are the characteristics of viruses? Bacteria? What kingdom do each of these belong? Are they living? Why or why not. ?. Kingdoms. Eukar. What do you already know?. What are the differences between viruses and bacteria?.