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Disease Unit Review key Sections 19.1, 19.2, 19.3, 40.1, and 40.2 Section 19.1: Bacteria 1. Draw or name the major parts of a bacteria cell. - Cell membrane - Cell wall (2 or 3) - DNA or RNA (plasmid) - Cytoplasm 2. What two kingdoms are prokaryotes split into, and how do those two kingdoms differ? Archaebacteria and Eubacteria Differences: archaebacteria live in extreme environments Eubacteria have peptidoglycan in their cell walls DNA in archaebacteria is more like eukaryotic DNA 3. Describe the four ways that prokaryotes are classified: a. Shape (cocci [round], bacilli [rod shaped], spirilli [spiral]) Can also be in staphylo (cluster) or strepto (long chain) arrangement b. Movement (can move using flagella, or can’t move at all) c. Gram Stain- Gram Positive bacteria have two cell walls, and turn purple using a gram stain. Gram Negative bacteria have three cell walls, and turn pink. d. How they get energy- can be photoautotrophs, chemoautotrophs, or heterotrophs (see definitions below). 4. Define the following methods of obtaining energy, and give an example of bacteria that do each: a. autotrophs: Make their own food using resources in the environment. Ex: cyanobacteria and archaebacteria b. photoautotrophs: Make their own food using light energy, similar to photosynthesis. Example: cyanobacteria (blue green algae) c. chemoautotrophs: Make their own food using chemicals in the environment. Example: archaebacteria that live in deep sea vents. d. heterotrophs: Rely on matter of other organisms for energy. Example: flesh eating bacteria Section 19.2: Viruses 5. Draw or list the main parts of a virus. - protein coat (capsid) - DNA or RNA (retroviruses have both) 6. List four reasons why viruses are not considered to be living things: a. they are parasites, needing a host to get energy b. they have no control over their movement c. they can’t reproduce on their own d. no nucleus, cytoplasm, organelles, or cell membrane 7. What is the difference between temperate and virulent viruses? Temperate viruses do not make you very sick, and do not act quickly. They often stay in the lysogenic cycle. Virulent viruses act very quickly, making you sick and entering the lytic cycle right away. 8. Define viroid and prion, and explain what they do. Viroid: genetic material on the run! DNA or RNA without a protein coat that hijacks cell enzymes to reproduce itself. Prion: protein on the run! Proteins that use ribosomes in cells to reproduce themselves, making large protein plaques- mad cow disease is the accumulation of protein plaques in the brain. 9. Draw or describe the lytic and lysogenic cycles of viral reproduction. How does the method of viral reproduction relate to a virus’ virulence? Lytic cycle: Virus injects its DNA or RNA into host; the virus reproduces itself using the cell’s organelles; within 1-2 days, the new viruses burst out of the cell and look for new cells to infect. Lysogenic Cycle: Virus injects its DNA into host; DNA becomes part of host’s DNA; Viral DNA reproduces every time cell divides. Virulent viruses tend to use the lytic cycle right away, making the host immediately ill. Lysogenic viruses can stay dormant, causing less severe, if any, illness. Section 19.3: Diseases Caused by Bacteria and Viruses 10. Explain two ways that bacteria cause disease. a. Releasing toxins (botulism, strep throat) b. Feeding off host tissues (flesh eating bacteria, tuberculosis) 11. What are antibiotics, and how do they treat bacterial infections? Antibiotics are toxins produced by bacteria to kill other bacteria in a competition for space on a host. They kill each other by disrupting cell walls. We have engineered bacteria to produce these antibiotics in large amounts, and to fight the bacteria we want them to. When you have a bacterial infection, you swallow or are injected with antibiotics to kill the infection inside of you. 12. Why can’t antibiotics be used on viruses? Antibiotics disrupt the cell wall of bacteria; since viruses don’t have cell walls, antibiotics don’t work. 13. What are vaccines, and how are they used to treat viral and bacterial disease? Vaccines are weakened or dead versions of a bacteria or virus. When we are injected with them, our immune system creates and stores antibodies to fight the disease when we get it for real. 14. For the following diseases, list what organism/parasite them and how they are prevented/treated: a. Influenza – Virus; vaccine to prevent, anti-viral medications to treat b. Staph infection- Bacteria; vaccine to prevent, antibiotics to treat c. E. coli food poisoning- Bacteria; vaccine to prevent, antibiotics to treat d. Mad cow disease- Prion; no prevention or treatment e. Malaria- Protist; does not respond to vaccines, antibiotics, or anti-virals f. Common cold- Virus; vaccine to prevent, anti-viral to treat g. HPV/Genital Warts- Virus; vaccine to prevent, anti-viral to treat f. Syphilis- Bacteria; vaccine to prevent, antibiotic to treat Section 40.1: Infectious Disease 15. List the four major causes of disease: a. Bacteria and Viruses b. Protists c. Worms d. Fungi Section 40.2: The Immune System 16. Describe four parts of your body’s first line of defense: a. skin: provides a protective barrier against pathogens b. mucus: traps pathogens and other foreign objects in nose, throat, and eyes. Cilia (tiny hairs) push the pathogens forward to be expelled from the body. c. Digestive fluids: stomach is very acidic, killing pathogens trying to live there. d. Enzymes in body fluids: lysozyme in blood and lymph fluid kills pathogens trying to live there. 17. Describe how the inflammatory response, your body’s second line of defense, works. When the first line of defense is broken, the inflammatory response occurs. Blood carries white blood cells to the scene to engulf pathogens. Your body raises its temperature (fever) to kill bacteria that can’t live above 98.6 degrees. The area of infection gets red, swollen, and painful because of the blood flow and death of white blood cells who are battling the bacteria. 18. What are interferons? Cells that have been infected with a virus release interferons, which are proteins that interrupt viral reproduction and infection of new host cells. 19. What triggers cell-mediated versus humoral immunity? Cell Mediated immunity is triggered by cells infected by viruses, or cells that have become cancerous. Humoral immunity is triggered by antigens in the blood stream and other bodily fluids. 20. Describe the process of humoral immunity, including the action of Memory B Cells, Plasma Cells, and Antibodies. B Cells bind to antigen, and become either Memory B cells or Plasma Cells. Memory B Cells are stored in lymph nodes, while Plasma Cells go into battle. Plasma Cells create antibodies that attack and destroy antigens. If you are infected with the same antigen again, the Memory B Cells divide to become Plasma Cells, who immediately have the antibodies to kill the antigen. 21. Describe the process of cell-mediated immunity, including the actions of Killer T, Suppressor T, Memory T, and Helper T Cells. The Helper T cells activates Killer T cells, who find and destroy infected by breaking through their cell membranes. Helper T cells also create Memory T cells to react faster to the same infection next time. Finally, Suppressor T cells turn off Killer T cells so they stop killing. 22. Circle the following immune functions that are non-specific: First line of defense, inflammatory response, cell-mediated immunity, humoral immunity, interferons Non Specific = first line of defense, inflammatory response, interferons Lab: Bacterial Transformation 23. State yes/no if you would see bacteria growing on your plate. If yes, what color would the bacteria be (white or blue)? Control pBlu LB LB/AMP/XGAL LB Yes/White No Yes/White LB/AMP/XGAL Yes/Blue 24. What was the purpose of exposing both samples to each type of plate? So that you can test all possibilities. With the pBlu you test on LB only, to make sure that you have living bacteria. This could help in answering questions as to why bacteria does or does not grow on the LB/AMP/XGal plate. Bacteria Inhibition Lab 25. How did you ensure that there was not cross contamination with your samples? Used sterilization method. Killing bacteria through using a flame source and burning the bacteria off. Also kept lid on petri dish at all times. 26. Draw a picture using arrows to show how you would streak a plate with bacteria. 27. Give an example for each variable in the lab. Control: water, same size filter paper disks, same bacteria Manipulated: different bacteriacides Responding: Zone of inhibition 28. What is the zone of inhibition? How do we measure it? Circular are around the filter paper disk where the bacteria was not able to grow. Measured diameter in mm.