Nester's Microbiology: A Human Perspective

Denise Anderson, Sarah Salm, Deborah Allen

Chapter 10

Identifying and Classifying Microorganisms - all with Video Answers

Educators

Chapter Questions

Problem 1

Which of the following is the newest taxonomic unit?
a) Strain
d) Species
b) Family
e) Domain
c) Order

Sylvia Puglisi

Sylvia Puglisi

Numerade Educator

Problem 2

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.

Sylvia Puglisi

Numerade Educator

Problem 3

The "breath test" for Helicobacter pylori infection detects the presence of which of the following?
a) Antigens
d) Lactose fermentation
b) Catalase
e) Urease
c) Hemolysis

Sylvia Puglisi

Numerade Educator

Problem 4

The "O157:H7" of E. coli O157:H7 refers to the
a) biotype. $\quad$
b) serotype
c) phage type.
d) ribotype.
e) antibiogram.

Sylvia Puglisi

Numerade Educator

Problem 5

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.

Sylvia Puglisi

Numerade Educator

Problem 6

Which of the following is an example of an evolutionary chronometer?
a) Ability to form endospores
b) $16 \mathrm{S}$ ribosomal RNA sequence
c) Sugar degradation
d) Motility

Sylvia Puglisi

Numerade Educator

Problem 7

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.

Sylvia Puglisi

Numerade Educator

Problem 8

If two microbial isolates have similar but different $16 \mathrm{S}$ rRNA sequences they are probably
a) both motile.
b) both pathogens.
c) both cocci.
d) members of the same domain.
e) the same strain.

Sylvia Puglisi

Numerade Educator

Problem 9

The sequence of which ribosomal genes are most commonly used for establishing phylogenetic relatedness?
a) $5 \mathrm{S}$
b) $16 \mathrm{S}$
c) $23 \mathrm{S}$
d) All of these are commonly used.

Sylvia Puglisi

Numerade Educator

Problem 10

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 Escherichia coli
e) Gel electrophoresis is used to determine the serotype of an organism.

Sylvia Puglisi

Numerade Educator