Bio 171 Module 5 Exam – Microbio Questions with 100% Correct Answer

The concept of treating all samples, whether known or unknown, as potentially hazardous (or pathogenic) materials is known as _____. Correct Answer universal 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 alpha-hemolytic 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