Page 8 of 9 83, W hich is not a characteristic of the coliform group? a) non-glu
ID: 217821 • Letter: P
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Page 8 of 9 83, W hich is not a characteristic of the coliform group? a) non-glucose fermenting b) lactose fermenting ) oxidase negative d) gram negative rods 84. E. coli 0157:H7 is an enteropathogenic strain, and a) the reservoir is the intestines of cattle-contaminates beef some cases develop into hemolytic uremic syndrome all of the above are correct b) d) none of the above are correct 85. Pseudomonas: The Pseudomonads; a) Many species produce pigments that diffuse into the medium and change its color b) They can adapt to a wide range of habitats and extract ATP from t c) They degrade extracellular materials with protease, amylase, pectinase, and numer d) They are important decomposers and bioremediators e) All of the above are correct tiny amounts of nutrients. ous enzymes. 86. Regarding Pseudomonas aeruginosa which is incorrect? a) is resistant to soaps, dyes, certain disinfectants, drugs, and drying b) is a frequent contaminant of ventilators, intravenous solutions, and anesthesia equipmen c) contaminates disinfected instruments, utensils, bathroom fixtures, and mops d) is incriminated in hospital outbreaks c) all of the above are correct 87. Pseudomonas aeruginosa is a typical opportunist. T or F 88. The most common nosocomal Pseudomonas infections occur in compromised hosts with severe burns, neoplastic disease, and premature birth. T or F [FACT] Blood infection is one of the most serious consequences with gram-negative bacteria, even if the species involved is not a virulent pathogen. Septic shock is a pathologic state of low blood pressure accompanied by a reduced amount of blood circulating to vital organs, particularly the brain, heart, lungs, and kidneys. Its major symptoms and signs are nausea, tachycardia, cold, clammy skin, and weak pulse. Damage to the organs can elicit respiratory failure, coma, heart failure, and death in a few hours. though the endotoxins of all gram-negative bacteria can cause shock, the most common clinical cases are due to gram-negative rods. 89. Nationwide, over 10 million patients a year die from a condition called septic shock. T or F 90. The adverse factor in gram-negative sepsis is the presence of an endotoxin called lipopolysaccharide (LPS) in the outer membrane of the gram-negative cell wall. T or F FACT] The Family Enterobacteriaceae is traditionally divided into two subcategories. The Coliforms are gram-negative normal enteric microbiota that ferment lactose rapidly (within 48 hours). Non-coliforms are generally non-lactose fermenting or slow lactose-fermenting bacteria that are either normal microbiota or regular pathogens. 91, Coliforms in the microbiota are rapid lactose-fermenting enteric bacteria that are; a) normal residents b) opportunistic residents c) include Escherichia coli d) all of the above are correct el none of the above are correct 92. Non-coliforms in normal microbiota are Lactose-negative bacteria that are opportunistic, normal gut residents for example Proteus vulgaris T or F 93. MacConkey Agar contains bile salts and crystal violet to inhibit gram-positive bacteria. It contains lactose and neutral red dye to indicate pH changes and differentiate the rapid lactose-fermenting bacteria from non-lactose-fermenters or slow fermenters. Lactose (+) colonies are red to pink from the accumulation of acid acting on the neutral red indicator. T or Levine's EMB agar also contains bile salts, plus eosin and methylene blue dyes that cause lactose- fermenters to develop a dark nucleus and sometimes a metallic sheen over the surface. Non-lactose- fermenters are pale lavender and nonnucleated. T or F 94. Hydrogen sulfide (HaS) production. Hydrogen sulfide gas is a product of the reduction of sulfur and is indicated by reacting with iron salts to form a black precipitate of ferric sulfide. T or F 95.Explanation / Answer
83.c.coliform are oxidase positive not negative.
84. C both are correct
85. E all are correct
86. All are correct
87 true
88 true
89 false. In US around 1 - 1.5 billion die from septic shock
90 true
91c
92 true
93 true
94 false it does not contain bile salt. Remaining statement is correct.
95 true
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