MIC 206 Lab Final Review Questions With Complete Solutions Bacteria of the skin and functions - Correct Answers✅-+Staphylococcus epidermis and Micrococcus luteus -Provide barrier vs. transient bacteria -Compete with nutrients and space Staph aureus skin infections, exotoxins and nosocomial infections - Correct Answers✅-Nasal flora that cause skin infections like boils, abscess, impetigo and scalded skin.-exotoxins cause food poisoning and toxic shock -30-50% of adults can spread nosocomial infections Presumptive tests and epidermis/aureus test results for MSA, catalase and coagulase - Correct Answers✅-Can detect a small amount of a microbe -Make MSA yellow (gram +) -Catalase (test used to eliminate catalase negative streptococci) -Aureus is coagulase +, epidermis - Aure and Epi antibiotic resistance and virulence - Correct Answers✅-Use of antibiotics makes them methicillin resistant -can be spread physically through skin or mouth/nose droplets respectively.Viral vs bacterial respiratory infections - Correct Answers✅-Viral infections are 80% causing ulcerated regions and rhinitis -bacteria are inflammatory associated with tonsilitis and pharyngitis How is strep pyogenes identified? - Correct Answers✅-"A" cell wall component -Beta hemolysis (RBC digestion) -Bacitracin sensitivity 1 / 3
MIC 206 Lab Final Review Questions With Complete Solutions -Referred to as Beta hemolytic Group A Strep (GAS) -causes rheumatic fever, TSS, scarlet fever and impetigo Streptococcus pneumoniae population diseases, hemolysis and antibiotic - Correct Answers✅-More common resident than pyogenes -causes otitis media, pneumonia, sinusitis and meningitis -Oxidizes Hb on the blood agar making it green, alpha hemolytic -sensitive to optochin Bacteria of the mouth - Correct Answers✅-Streptococcus salivarius and streptococcus oralis -catalase -, gram + -Break down sucrose to make glucan capsules Dental plaque - Correct Answers✅-made of bacterial masses, glucan capsules and debris in teeth Streptococcus mutans - Correct Answers✅-Create dental carries by fermenting sugar into lactic acid eroding enamel -Correlated with high sugar diet Dental carries - Correct Answers✅-Enamel erosion exposes dentin -pulp containing BVs and nerves become affected leading to an abscess -Dentists clean infection and fill hole Mitis Salivarius Agar - Correct Answers✅-Differential media isolating carious oral streptococci -5% sucrose promoting glucan capsule formation 2 / 3
MIC 206 Lab Final Review Questions With Complete Solutions Snyder Test Agar - Correct Answers✅-Has dextrose and determines dental carry susceptibility -Sugar fermentation causes <4.6 pH bromocresol green indicator to yellow -Suggests S mutans and lactobacilli make enough acid to decalcify teeth The Skin - Correct Answers✅-Keeps out pathogens, UV light and chemicals -Several cell layers Melanin - Correct Answers✅-Antimicrobial properties and protects VS UV rays perspiration - Correct Answers✅-Acidic Ph and high salt -flushes microbes Lysozyme - Correct Answers✅-In sweat, attacks NAG-NAM bonds Sebum - Correct Answers✅-Oil with fatty acids and proteins moisturizing skin.Factors affecting skin microbiota - Correct Answers✅-Environmental exposure, occupation, antibiotic usage, age, cosmetics, moisturizers, choice of soap, or clothing What goes insisde the Biohazard Trash Can/Sterilization Cart? - Correct Answers✅Contaminated solid waste Why are test tubes collected at the end of lab ? - Correct Answers✅To be sterilized
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