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MIC 101 Exam 1 Page 16 29. Approximately 25% of Humans have Staphylococcus aureus as Part of their normal Skin Flora. It is a common Cause of Nosocomial (Hospital-Acquired) Infections. Approximately 40% of Humans who have Staphylococcus aureus have Methicillin-Resistant Staphylococcus aureus (MRSA). It is particularly common Cause of Nosocomial Infections associated with Deep Wounds or Catheters. Which of the following is the best Depiction of the Structure of Peptidoglycan in the Cell Wall of Staphylococcus aureus ? (“A” and “B” are on this Page; “C” and “D” are on Page 17.) A. NAG - NAM - NAG - NAM - NAG - NAM - NAG | AA | AA | AA | AA --- AA | AA | AA | AA | NAG - NAM - NAG - NAM - NAG - NAM - NAG ____________________________________________ B. NAG - NAM - NAG - NAM - NAG - NAM - NAG | AA | AA | AA AA | | AA --- AA | AA | AA | NAM - NAG - NAM - NAG - NAM - NAG - NAM
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MIC 101 Exam 1 Page 17 (“B” and “C” are on this Page; “A” and “B” are on Page 16.) C. NAG - NAM - NAG - NAM - NAG - NAM - NAG | AA | AA | AA | AA- aa - aa - aa - aa - aa -AA | AA | AA | AA | NAG - NAM - NAG - NAM - NAG - NAM - NAG ____________________________________________ D. NAG - NAM - NAG - NAM - NAG - NAM - NAG | AA | AA | AA AA | | AA- aa - aa - aa - aa - aa -AA | AA | AA | NAG - NAM - NAG - NAM - NAG - NAM - NAG
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MIC 101 Exam 1 Page 18 30. A new Group of Pathogens called E. coli ST131 (ST= Sequence Type) are very resistant to Antibiotics and yet do not seem to be compromised in their Virulence Capacity. Over the past 10 Years or so, E. coli ST131 strains have spread from South Asia to Europe to North America, where they are now one of the Primary Causes of Urinary Tract Infections (UTIs) and Bacterial Sepsis (G= rotten) . Studies suggest that they likely spread so quickly via Intercontinental Maritime Shipping and Commercial Aviation Routes. The Outer Membrane of E. coli ST 131 contains - A. Respiratory Enzymes for generating ATP from Aerobic Respiration (by translocating H + into the Cell). B. Braun ʼ s Lipoprotein (which joins the Outer Membrane to the Peptidoglycan), Porin Proteins and Lipopolysaccharides (LPS). C. Photosystems for generating ATP from Photosynthesis (by translocating H + out of the Cell). D. Teichoic Acid (which joins the Outer Membrane to the Peptidoglycan), Porin Proteins and Lipopolysaccharides (LPS). 31. The Periplasm of E. coli ST 131 contains --
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MIC 101 Exam 1 Page 19
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