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Diseases Caused by Bacteria and Viruses

Diseases Caused by Bacteria and Viruses . Section 19-3 This section describes bacterial and viral diseases. . Bacterial Disease in Humans . What are pathogens? They are disease-causing agents. . Bacterial Disease in Humans. What are the two general ways that bacteria cause disease?

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Diseases Caused by Bacteria and Viruses

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  1. Diseases Caused by Bacteria and Viruses Section 19-3 • This section describes bacterial and viral diseases.

  2. Bacterial Disease in Humans • What are pathogens? • They are disease-causing agents.

  3. Bacterial Disease in Humans • What are the two general ways that bacteria cause disease? • Some damage the tissues of the infected organism directly by breaking them down for food. • Others release toxins that harm the body.

  4. Bacterial Disease in Humans • What kind of tissue do the bacteria that cause tuberculosis break down? • They break down lung tissue.

  5. Bacterial Disease in Humans What are antibiotics? • They are compounds that block the growth and reproduction of bacteria.

  6. Bacterial Disease in Humans • What is one of the major reasons for the dramatic increase in life expectancy during the past two centuries? • There is an increased understanding of how to prevent and cure bacterial infections.

  7. Controlling Bacteria What is sterilization? • It is a way of destroying all bacteria by subjecting them to great heat.

  8. Controlling Bacteria • A chemical solution that kills pathogenic bacteria is called a(an) _____. • disinfectant

  9. Controlling Bacteria • Why will food stored at low temperatures keep longer? • The bacteria in the food will takemuch longer to multiply.

  10. Controlling Bacteria • How can food be preserved through canning? • This method involves heating food to a high temperature and then immediately placing it into sterile glass jars or metal cans and sealing the container.

  11. Controlling Bacteria • What everyday chemicals can be used to inhibit the growth of bacteria in food? • They include salt, vinegar, and sugar.

  12. Viral Disease in Humans • What are some human diseases that viruses cause? • Viruses cause polio, measles, aids,mumps, influenza, yellow fever, smallpox, the common cold, and many other diseases.

  13. Bacteria and Viruses Viral Disease in Animals • Cancer-causing viruses are known as_____. • oncogenic viruses

  14. Bacteria and Viruses • Viroids and Prions • A disease-causing particle that contains only protein and not DNA or RNA is called a(an)_____. • prion

  15. WordWise • What is the viral DNA that is embedded in a host’s DNA? • prophage

  16. BACTERIA AND VIRUSES • What is a rod-shaped bacterium? • bacillus

  17. BACTERIA AND VIRUSES • What is a compound that blocks the growth and reproduction of bacteria? • antibiotic

  18. BACTERIA AND VIRUSES • What is a virus that infects bacteria? • bacteriophage

  19. BACTERIA AND VIRUSES • What is a prokaryote that can capture sunlight for energy but also needs organic compounds for nutrition? • photoheterotroph

  20. BACTERIA AND VIRUSES • What is the exchange of genetic information that occurs from one bacterium to another through a hollow bridge? • conjugation

  21. BACTERIA AND VIRUSES • What is a virus that contains RNA as its genetic information? • retrovirus

  22. BACTERIA AND VIRUSES • What is the process in which nitrogen is converted into a form plants can use? • nitrogen fixation

  23. BACTERIA AND VIRUSES • Hidden Word: pathogen • Definition: A disease-causing agent

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