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ch27 and ch28 - Chapters 27 28 The Hidden World of Microbes...

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Chapters 27 & 28 The Hidden World of Microbes Microbes-too small to be seen clearly w/o a microscope Doesn’t cause disease Prokaryotes range in size 0.2-1.0 nm Unicellular eukaryotes range in size of 10-100 µm Other Biological Entities Even smaller than bacteria Not organisms because they don’t have all the characteristics of life Viruses: Small (0.05-0.2 µm) and come in many different shapes o 3 parts Genome: genetic information Can be either single stranded or double stranded RNA or DNA Capsid: protein coat which surrounds and protects genome Envelope: membrane (phospholipid bilayer) which surrounds the capsid o Hijack cells Highly specific for organism it infects H1N1 A group of viruses 2 viruses Influenza The flu Highly contagious respiratory infection The influenza virus usually enter the body through mucus membranes in the mouth, nose, or eyes On average in the U.S. each year: 5% to 20% of the population gets the flu; more than 200,000 people are hospitalized from flu complication; and about 36,000 people die from the flu Around the world, average of approximately 1 billion cases of the flu, around 3-5 million cases of severe illness, and 300,000-500,000 deaths annually Causes of death o Pneumonia and from exacerbations of cardiopulmonary conditions and other chronic diseases o Deaths of older adults account for more than 90% of deaths attributed to pneumonia and influenza The common symptoms of the flu o Fever (usually high) o Headache o Muscle aches o Chills
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o Extreme tiredness o Dry cough o Runny nose o Stomach symptoms Nausea Vomiting Diarrhea What is the new flu called? Swine flu H1N1 o H: hemagglutinin Influenza hemagglutinin (HA) is a type of hemagglutinin found on the surface of the influenza viruses o 2 primary functions To identify target cells by binding to host cells
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