MODULE 5 EXAM - BIO171 MICROBIO FULL EXAM

MODULE 5 EXAM - BIO171 MICROBIO FULL EXAM The concept of treating all samples, whether known or unknown, as potentially hazardous (or pathogenic) materials is known as _____. - CORRECT ANSWERuniversal precautions List at least 3 observations a researchers would be sure to note while assessing an unknown microbial sample. - CORRECT ANSWER-size and shape, motility, gram status, color change, chemical reactions While observing an unknown sample of limited amounts, a researcher must determine motility and Gram status using the same sample. What would you determine first and why? - CORRECT ANSWER-Motility because Gram staining requires the sample be fixed which would kill the organism and then you can't observe motility a Facultative anaerobe is a microorganism capable of growth under what conditions? - CORRECT ANSWER-A microorganism capable of growth under aerobic and anaerobic conditions as streptococcus is catalase negative would it thrive or die in the presence of peroxides? Why? - CORRECT ANSWER-strep would not survive in the presence of peroxides b/c it is unable to breakdown peroxides strep is most often streaked onto: 1.) chocolate agar 2.) EMB agar 3.) Blood agar 4.) Spirit blue agar - CORRECT ANSWER-blood agar True or false: the Lancefield groups are used to subdivide antigenic groups of alphahemolytic Steptococcus - CORRECT ANSWER-false The distinctions for Lancefield groupings lie in its - CORRECT ANSWER-Carbohydrate composition of antigens left untreated, strep throat can progress to___, which displays ___ hemolytic activity. - CORRECT ANSWER-Rheumatic fever ; beta Rheumatic fever displays (blank) hemolytic activity and occurs when (blank) is left untreated - CORRECT ANSWER-Beta, strep True or false: under most circumstances, staphylococcus can be found in ~80% of the human population where it remains non-symptomatic - CORRECT ANSWER-false Define commensal bacteria - CORRECT ANSWER-It neither harms nor benefits from the host from which it obtains nutrients pathogen suppresses host immune system so it can continue replicating - CORRECT ANSWER-evasion pathogen passes through or between cells to access deeper tissues and nutrients - CORRECT ANSWER-infection pathogen is passed to another host to restart lifecycle - CORRECT ANSWERtransmission Match the following diseases with their respective symptoms: 1. folliculitis 2. scaled- skin syndrome igo ctivitis lma neonatorum A. Childhood skin disease near mouth/ nose B. infection of thin, transparent scleral tissue C. infection occurs at time of birth D. Pus-filled lesions on skin or hair E. Ruptured pustules ; treated with penicillin - CORRECT ANSWER-1.) D 2.) E 3.) A 4.) B 5.) C True or false. The causative agent of conjunctivitis can be either bacterial or viral - CORRECT ANSWER-true True or false: An acid fast stain is best suited to identify TB - CORRECT ANSWER-true True or false: Although TB must be inhaled and reside in the lung in order to cause infection, TB can also spread to the brain, spine, and kidneys - CORRECT ANSWERtrue Identify the disease based on the following: it is a small, acid-fast rod usually remaining asymptomatic for up to 20 years. It affects the skin, nerves, upper respiratory tract, and eyes of infected individuals - CORRECT ANSWER-Leprosy/Hansen's disease True or false: you can become infected with TB simply by sharing a drink with someone who is currently infected with TB - CORRECT ANSWER-false True or false: only directly ingesting the pre-formed Clostridium toxin (neither the bacteria nor its spores) will cause disease in adults - CORRECT ANSWER-true True or false : Directly ingesting clostridium or its associated spores will not cause illness in adults - CORRECT ANSWER-false A 5-month-old child is given honey at breakfast and begins showing symptoms consistent with botulism. Would the child's illness be classified as foodborne, infant or wound botulism? - CORRECT ANSWER-Infant Botulism ; the GI tract of an infant is not developed enough to handle honey which is a carrier of clostridium True or false: there are currently no cures for tetanus - CORRECT ANSWER-true While visiting his grandparents, a 10-year-old child has been given green beans for dinner that were harvested from his grandparents' garden and canned the previous year. Severe illness sets in and the child is taken to the hospital. Botulism is suspected, but what form? Explain - CORRECT ANSWER-Foodborne botulism because he's too old for it to be infant and it's not a wound so the green beans were probably improperly canned True or False. Although there is no cure for tetanus, it can be prevented through vaccination. - CORRECT ANSWER-true Why does the alpha toxin (perfringolysin) produced during an infection of gas gangrene cause cell death? (short answer) - CORRECT ANSWER-The toxin perforates the membrane. It forms pores in the plasma membrane of host cells resulting in uncontrolled ion fluxes and eventually cell lysis and death The alpha toxin perfringolysin is associated with which medical condition caused by Gram positive anaerobic bacteria? - CORRECT ANSWER-Gas gangrene True or false : Bubonic plague is often characterized by Gas gangrene painffully swollen lymph nodes - CORRECT ANSWER-true Which form of the plague is the most rare? what does it target? - CORRECT ANSWERSepticemic and it targets the blood system indentify the following disease : " bulleyes rash"