Study guide for 2nd midterm SAS5

Study guide for 2nd - 1 Study guide for 2nd midterm SAS5 Science Society and Disease Lecture 10-18 LECTURE 10 1 Cryphonectria parasitica is a

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1 Study guide for 2nd midterm SAS5: S cience Society and Disease: Lecture 10-18 LECTURE 10 1.) Cryphonectria parasitica is a fungus that pretty much wiped out American chestnut trees in the US in the early 20th century. How was this pathogen introduced into the US? a.) Cryphonectria parasitica has devastated the chestnut in North America. It was probably brought over from Asia in a load of trees that were brought to the USA in hopes of producing larger nuts. b.) In 1904, New York first report of cankers on American chestnut: affected trees and healthy trees nearby were burned. 2.) What are two of the symptoms of chestnut blight, a disease caused by the fungus Cryphonectria parasitica? 1.) Girdling of trees 2.) Cankers on the stems 3.) One might say that Cryphonectria hypovirus causes a sexually transmitted disease of fungi. Why? a.) spread by interaction of two compatible strains (form cytoplasmic bridge) b.) also spread by asexual spores 4. )In what three ways does infection with the Cryphonectria hypovirus change Cryphonectria parasitica? 1.) Weak sporulation 2.) Slow growth 3.) Reduced virulence 5.)Bdellovibrio bacteriovorus is a predator of bacteria. Bdellovibrio can reach swimming speeds of 160 micrometers, or about 160 body lengths, per second. Scaled to human proportions, that would be equal to 288 meters per second, or about 1000 km (650 miles) per hour. How is this property exploited by Bdellovibrio? 1.) Bores into host bacteria 2.) Seals the hole and enters periplasmic space (space between the inner and outer membrane of the bacterial cell) 6.) Bdellovibrio bacteriovorans is an ‘obligate intracellular parasite’. What does this mean?
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2 Obligate intracellular parasites are parasitic microorganisms that cannot reproduce outside their host cell, forcing the host to assist in the parasite's reproduction. 7.) Describe at least one thing that the life cycles of Bdellovibrio and bacteriophages have in common. Ubiquitous in nature- found everywhere! 8.) What properties of Bdellovibrio make it an interesting candidate for use as a living antibiotic? Name and briefly describe at least two of those properties. 1.) Ubiquitous in nature- found everywhere 2.) Inhabits human and animal intestine- found in human and animal intestine 3.) Attacks bacteria like Salmonella, E.coli, Pseudomonas 4.) Does not infect mammalian cells- which is a plus 5.) Weakly immunogenic- does not cause an immune reaction in the body, we are safe 9.) What is a bacteriophage? A virus capable of infecting a bacterial cell, and may cause lysis to its host cell. 10.) Which one of the two life cycle stages of a bacteriophage is most detrimental to a bacterium: the lyticphase or the lysogenic phase? Explain briefly why. During the
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This note was uploaded on 06/15/2010 for the course SAS SAS005 taught by Professor gordon/leveau during the Winter '10 term at UC Davis.

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Study guide for 2nd - 1 Study guide for 2nd midterm SAS5 Science Society and Disease Lecture 10-18 LECTURE 10 1 Cryphonectria parasitica is a

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