Ch 10 Review Questions

Term
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Which of the following is the newest taxonomic unit
a. strain
b. family
c. order
d. species
e. domain
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Terms in this set (10)
Which of the following is the newest taxonomic unit
a. strain
b. family
c. order
d. species
e. domain
e. domain
If an acid-fast bacterium is detected in a clinical sample, then the organism could be
a. cryptococcus neoformans
b. mycobacterium tuberculosis
c. Neisseria gonorrhoeae
d. streptococcus pneumoniae
e. streptococcus pyogenes
b. mycobacterium tuberculosis
The "breath test" for Helicobacter pylori infection determines which of the following
a. antigens
b. catalase
c. hemolysis
d. lactose fermentation
e. urease
e. urease
the "O157:H7" of e coli O157:h7 refers to the
a. biotype
b. serotype
c. phage type
d. antibiogram
b. serotype
when hydrogen peroxide is placed on a colony of an unknown bacterium, bubbles form. based on this information, you can conclude that the bacterium
a. is staphylococcus epidermidis
b. is a lactic acid bacterium
c. is beta-hemolytic
d. is catalase positive
e. can cause strep throat
d. is catalase positive
which of the following is best to use for determining the evolutionary relatedness of organisms
a. ability to form endospores
b. 16S ribosomal RNA
c. sugar degradation
d. motility
b. 16S ribosomal RNA
if the GC content of two organisms is 70%, the
a. organisms are definitely related
b. organisms are definitely not related
c. AT content is 30%
d. organisms likely have extensive DNA homology
e. organisms likely have many characteristics in common
c. AT content is 30%
If two microbial isolates have similar but different 16S rRNA sequences they are probably
a. both motile.
b. both pathogens.
c. both cocci.
d. members of the same domain.
e. the same strain.
d. members of the same domain
the sequence of which ribosomal genes are most commonly used for establishing phylogenetic relatedness
a. 5S
b. 16S
c. 23S
d. all of these are commonly used
b. 16S
which of the following is false
a. tropheryma whipplei could be identified before it had been grown in culture
b. the GC content of DNA can be measured by determining the temperature at which double-stranded DNA melts
c. sequence differences between organisms can be used to assess their relatedness
d. based on DNA homology studies, members of the genus shigella should be in the same species as e coli
e. gel electrophoresis is used to determine the serotype of an organism
e. gel electrophoresis is used to determine the serotype of an organism