Chapter 19-Viruses and bacteria

Chapter 19-Viruses and bacteria - Chapter 19: Viruses and...

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Chapter 19: Viruses and Bacteria
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Which is Which? Which of these are caused by viruses and which are caused by bacteria Measles Chicken Pox Strep throat Staph infection Polio Ebola fever AIDS Tetanus Tuberculosis Gangrene Flu Syphilis Common Cold Gonorrhea Herpes Pink eye Shingles Rabies V V B B V V V B B B V B V B V B V V
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General Characteristics of Viruses 2 Major Parts : 1. Hereditary material (DNA or RNA) 2. A protein coat surrounding the molecule.
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Why are viruses not living? They cannot live (and reproduce) withou t a host . They have NO : membranes, ribosomes (can’t make proteins), cytoplasm, sources of energy.
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Reasons why viruses are not living. Viruses cannot: Grow Reproduce Respond to Stimuli Maintain Homeostasis Get Energy Interestingly though, they can evolve
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Viruses are Host Specific Bacteriophage - viruses that infect bacteria
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Viruses are Host Specific Examples : Common cold virus only attacks membranes of the respiratory tract Herpes Viruses - One kind attacks the mucous membranes of the mouth and lips (cold sores) Another herpes virus attacks mucous membranes of the genitals (genital sores)
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Viruses are Host Specific AIDS – HIV virus attacks white blood cells
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1. Penetration - Engulfed by host by binding to receptors on the host cell’s membrane ( endocytosis ) •. or viral envelope fuses with the host cell
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Chapter 19-Viruses and bacteria - Chapter 19: Viruses and...

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