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module 5 exam - bio171 microbio Questions and Answers
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module 5 exam - bio171 microbioThe concept of treating all samples, whether known or unknown, as potentially
hazardous (or pathogenic) materials is known as _____. - answeruniversal precautions
List at least 3 observations a researchers would be sure to note while assessing an
unknown microbial sample. - answersize 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? - answerMotility 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? -
answerA 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? - answerstrep 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 - answerblood agar
True or false: the Lancefield groups are used to subdivide antigenic groups of alpha-
hemolytic Steptococcus - answerfalse
The distinctions for Lancefield groupings lie in its - answerCarbohydrate composition of
antigens
left untreated, strep throat can progress to___, which displays ___ hemolytic activity. -
answerRheumatic fever ; beta
Rheumatic fever displays (blank) hemolytic activity and occurs when (blank) is left
untreated - answerBeta, strep
True or false: under most circumstances, staphylococcus can be found in ~80% of the
human population where it remains non-symptomatic - answerfalse
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