Microbiology Quiz 3 Material Questions With Accurate Answers A+ Graded

Microbiology Quiz 3 Material Questions With Accurate Answers A+ Graded True or false: Clostridia is aerobic - ANS-FALSE. Clostridia are obligate anaerobes How are anaerobic samples obtained? - ANS-Send sample to lab ASAP. use container with thioglycolate (an oxygen-reducing agent). Where are Clostridia naturally found? - ANS-soil True or false: Clostridia form spores. - ANS-TRUE. Location of the spore in the bacterium may aid in species identification (Ex. terminal spores tell you it is Clostridium tetani) What is the morphology of Clostridia? - ANS-gram (+) rods True or false: Clostridia are catalase (+) - ANS-FALSE. All anaerobes are catalase (-). Aerobic bacteria use O2 as a final electron acceptor and produce superoxide which can be damaging to DNA. These organisms use catalase to help breakdown superoxide to H20 and O2. Since anaerobes don't produce toxic oxidative species, they do not need catalase. Are clostridia oxidase (-)? - ANS-YES. They do not perform oxidation-reduction reactions which are a part of the electron transport chain. How do anaerobes get energy? - ANS-1) glucose --> lactate + ATP 2) glucose --> ethanol + ATP What are the two main mechanisms clostridia cause disease? - ANS-1) toxin-mediated disease 2) invasion and inflammation What are the four species of clostridium? - ANS-Clostridium... 1) botulism 2) tetani 3) difficile 4) perfringens What is the morphology of clostridium tetanus? - ANS...