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REHS - Microbiology Exam Questions and Complete Solutions Graded A+
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REHS - Microbiology Exam Questions and Complete Solutions Graded A+
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REHS -Microbiology Exam
Questions and
Complete Solutions
Graded A+
Denning [Date] [Course title]
,Acid Fast stain is for what type of bacteria - Answer: Mycobacterium (tuberculosis and leprosy)
What type of bacteria forms spores? - Answer: gram +, bacillus and clostridium
obligate aerobes - Answer: organism that requires a constant supply of oxygen in order to live
obligate anaerobes - Answer: poisoned by oxygen
facultative anaerobes - Answer: prefer oxygen, but can survive without it
Psychrophiles - Answer: -20 to 10 Celsius, humans too warm
Mesophiles - Answer: 20-45 Celsius, humans just right
Thermophiles - Answer: 41-122 Celsius, humans too cold
Acidophiles - Answer: 5.0 and lower pH (human stomach is 3.0)
Neutrophiles - Answer: 6.5-7.5 pH, most bacteria
alkalophiles - Answer: 8.5-11 pH
Halophiles - Answer: 0ver 10% salt
Halotolerant - Answer: up to 10% salt
Osmophiles - Answer: live in habitats with high solute concentration (sugar)
Xerophiles - Answer: organisms able to grow in very dry environments
, Exotoxin - Answer: a toxin released by a living bacterial cell into its surroundings., gram positive
Endotoxin - Answer: a toxin that is present inside a bacterial cell and is released when the cell
disintegrates, gram negative
Enterotoxin example - Answer: staphylococcus aureus
Neurotoxin example - Answer: Clostridium botulinum
Cytotoxin example - Answer: Diphtheria toxin
naturally acquired active immunity - Answer: resulting from infection
artificially acquired active immunity - Answer: vaccination
Naturally acquired passive immunity - Answer: Transplacental or via colostrum
artificially acquired passive immunity - Answer: injection of antibodies (short-term)
Nausea, vomiting and cramps, 30min-6hours after infection and lasts about a day, is which microbe? -
Answer: Staphylococcus aureus from sliced meat, pudding, high protein food
Diarrhea, stomach cramps (no vomiting) 6-24 hours after consumption, lasts about a day, is which
microbe? - Answer: Clostridium perfringens from roasts, gravies, stews
Diarrhea, nausea, vomiting 12-48 hours after consumption (or contact), lasts a few days, is which
pathogen? - Answer: Norovirus from infected person, fresh produce or shellfish
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