Question 1

Which of the following characteristics indicates that two organisms are closely related?

Accepted Answer

A)   Their DNA can hybridize together.
B)   Both are cocci.
C)   Both are motile.
D)   Both ferment lactose.
E)   Both normally live in clams.F) B) and E)
G) A) and B)

Question 2

Into which group would you place a photosynthetic cell that lacks a nucleus?

Accepted Answer

A)   Animalia
B)   Bacteria
C)   Protista
D)   Fungi
E)   PlantaeF) B) and E)
G) None of the above

Question 3

Phage typing is based on the fact that

Accepted Answer

A)   bacterial viruses attack only members of a specific species.
B)   viruses cause disease.
C)   bacteria are destroyed by viruses.
D)   phages and bacteria are related.
E)   Staphylococcus causes infections.F) A) and B)
G) A) and C)

Question 4

Which of the following is the best evidence for a three-domain system?

Accepted Answer

A)   There are three distinctly different Gram reactions.
B)   There are three distinctly different sets of metabolic reactions.
C)   Nucleotide sequences in ribosomal RNA vary between all three domains.
D)   Some bacteria live in extreme environments.
E)   There are three distinctly different types of nuclei.F) B) and C)
G) A) and B)

Question 5

Nucleic acid hybridization is based on the fact that

Accepted Answer

A)   all cells have DNA.
B)   a chromosome is composed of complementary strands.
C)   pairing between complementary bases occurs.
D)   DNA is composed of genes.
E)   the strands of DNA can be separated.F) A) and B)
G) B) and C)

Question 6

Which of the following best defines a strain in microbiological terms?

Accepted Answer

A)   a pure culture that is not totally identical to other cultures of the same species
B)   groups of cells all derived from and identical to a single parent species
C)   same as a species
D)   a mixed population of cells,genetically distinct, but with highly similar phenotypic characteristics
E)   a group of organisms with a limited geographical distributionF) B) and E)
G) C) and E)

Question 7

Chloroplasts possess circular DNA and reproduce by binary fission.

Accepted Answer

A) True 
 B)False  True

Question 8

The phylogenetic classification of bacteria is based on

Accepted Answer

A)   cell morphology.
B)   Gram reaction.
C)   habitat.
D)   diseases.
E)   rRNA sequences.F) A) and B)
G) A) and C)

Question 9

Into which group would you place a unicellular organism that has 70S ribosomes and a peptidoglycan cell wall?

Accepted Answer

A)   Animalia
B)   Plantae
C)   Bacteria
D)   Fungi
E)   ProtistF) A) and D)
G) B) and C)

Question 10

A biochemical test, in the microbiology world, is used to determine

Accepted Answer

A)   staining characteristics.
B)   amino acid sequences of enzymes.
C)   capability of a microbe to perform a specific enzymatic activity.
D)   nucleic acid-base composition of DNA sequences.
E)   All of the answers are correct.F) B) and C)
G) All of the above C

Question 11

A clone is

Accepted Answer

A)   a genetically engineered cell.
B)   a mound of cells on an agar medium.
C)   a taxon composed of species.
D)   genetically identical cells derived from a single cell.
E)   None of the answers is correct.F) D) and E)
G) B) and C)

Question 12

Figure 10.2 A nucleic acid hybridization experiment produced the following results.
 In Figure 10.2, which figure shows the most closely related organisms?

Accepted Answer

A)   a
B)   b
C)   c
D)   d
E)   eF) B) and E)
G) None of the above

Question 13

The arrangement of organisms into taxa

Accepted Answer

A)   shows relationships to common ancestors.
B)   shows degrees of relatedness between organisms.
C)   is arbitrary.
D)   is based on evolution.
E)   was designed by Charles Darwin.F) A) and B)
G) B) and C)

Question 14

All of the following statements are reasons why fluorescent in situ hybridization (FISH)  has become a valuable tool for environmental microbiologists EXCEPT

Accepted Answer

A)   it allows observation of microbes in their natural environment in association with other microbes.
B)   it allows one to obtain pure cultures of microbes.
C)   it demonstrates the diversity of microbes in an environment.
D)   it allows for detection of uncultured microbes.
E)   All of the answers are correct.F) A) and B)
G) C) and D)

Question 15

If two organisms have similar rRNA sequences, you can conclude that they

Accepted Answer

A)   live in the same place.
B)   will have different G-C ratios.
C)   mated with each other.
D)   will both ferment lactose.
E)   evolved from a common ancestor.F) None of the above
G) A) and B)

Question 16

Serological testing is used for screening bacterial isolates for similarities.

Accepted Answer

A) True 
 B)False

Question 17

The highest level in the current taxonomic hierarchy is ʺKingdom.ʺ

Accepted Answer

A) True 
 B)False

Question 18

Serological testing is based on the fact that

Accepted Answer

A)   the human body makes antibodies against bacteria.
B)   antibodies react specifically with an antigen.
C)   bacteria clump together when mixed with any antibodies.
D)   antibodies cause the formation of antigens.
E)   all bacteria have the same antigens.F) None of the above
G) D) and E)

Question 19

Table 10.2
 I. Gram-positive
A. Catalase  +++ 
1. Acid from glucose........... Staphylococcus
2. Glucose.........................Micrococcus
B. Catalase-
1. Coccus.........................Streptococcus
2. Rod ..........................Lactobacillus
II. Gram-negative
A. Oxidase-
1. Acid from lactose
a. Uses citric acid..........................Citrobacter
b. Citric acid.................................Escherichia
2. Lactose-
a.  H2 S\mathrm { H } _ { 2 } \mathrm {~S}H2​ S  produced
(1)  Urease positive............................Proteus
(2)  Urease negative.............................. Salmonella
B. Oxidase  +++ 
1. Rod...........................Pseudomonas
2. Coccus....................... Neisseria
-Use the dichotomous key in Table 10.2 to identify a gram -negative coccus.

Accepted Answer

A)   Micrococcus
B)   Neisseria
C)   Pseudomonas
D)   Staphylococcus
E)   Streptococcus F) A) and E)
G) A) and B)

Question 20

Which of the following statements is a reason for NOT classifying viruses in one of the three domains of life (Bacteria, Archaea, Eukarya)  rather than in a fourth separate domain?

Accepted Answer

A)   Viruses direct anabolic pathways of host cells.
B)   Viruses are not composed of cells.
C)   Some viruses can incorporate their genome into a hostʹs genome.
D)   Viruses are obligate parasites.
E)   All of the answers are correct.F) A) and B)
G) B) and C) B

Exam 10: Classification of Microorganisms

Which of the following characteristics indicates that two organisms are closely related?

Correct Answer
verified

Into which group would you place a photosynthetic cell that lacks a nucleus?

Correct Answer
verified

Phage typing is based on the fact that

Correct Answer
verified

Which of the following is the best evidence for a three-domain system?

Correct Answer
verified

Nucleic acid hybridization is based on the fact that

Correct Answer
verified

Which of the following best defines a strain in microbiological terms?

Correct Answer
verified

Chloroplasts possess circular DNA and reproduce by binary fission.

Correct Answer
verified
True

The phylogenetic classification of bacteria is based on

Correct Answer
verified

Into which group would you place a unicellular organism that has 70S ribosomes and a peptidoglycan cell wall?

Correct Answer
verified

A biochemical test, in the microbiology world, is used to determine

Correct Answer
verified
C

A clone is

Correct Answer
verified

Figure 10.2 A nucleic acid hybridization experiment produced the following results. In Figure 10.2, which figure shows the most closely related organisms?

Correct Answer
verified

The arrangement of organisms into taxa

Correct Answer
verified

All of the following statements are reasons why fluorescent in situ hybridization (FISH) has become a valuable tool for environmental microbiologists EXCEPT

Correct Answer
verified

If two organisms have similar rRNA sequences, you can conclude that they

Correct Answer
verified

Serological testing is used for screening bacterial isolates for similarities.

Correct Answer
verified

The highest level in the current taxonomic hierarchy is ʺKingdom.ʺ

Correct Answer
verified

Serological testing is based on the fact that

Correct Answer
verified

Correct Answer
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Which of the following statements is a reason for NOT classifying viruses in one of the three domains of life (Bacteria, Archaea, Eukarya) rather than in a fourth separate domain?

Correct Answer
verified
B

Exam 10: Classification of Microorganisms

Which of the following characteristics indicates that two organisms are closely related?

Correct AnswerverifiedShow Answer

Into which group would you place a photosynthetic cell that lacks a nucleus?

Correct AnswerverifiedShow Answer

Phage typing is based on the fact that

Correct AnswerverifiedShow Answer

Which of the following is the best evidence for a three-domain system?

Correct AnswerverifiedShow Answer

Nucleic acid hybridization is based on the fact that

Correct AnswerverifiedShow Answer

Which of the following best defines a strain in microbiological terms?

Correct AnswerverifiedShow Answer

Chloroplasts possess circular DNA and reproduce by binary fission.

Correct AnswerverifiedTrue

The phylogenetic classification of bacteria is based on

Correct AnswerverifiedShow Answer

Into which group would you place a unicellular organism that has 70S ribosomes and a peptidoglycan cell wall?

Correct AnswerverifiedShow Answer

A biochemical test, in the microbiology world, is used to determine

Correct AnswerverifiedC

A clone is

Correct AnswerverifiedShow Answer

Figure 10.2 A nucleic acid hybridization experiment produced the following results. In Figure 10.2, which figure shows the most closely related organisms?

Correct AnswerverifiedShow Answer

The arrangement of organisms into taxa

Correct AnswerverifiedShow Answer

All of the following statements are reasons why fluorescent in situ hybridization (FISH) has become a valuable tool for environmental microbiologists EXCEPT

Correct AnswerverifiedShow Answer

If two organisms have similar rRNA sequences, you can conclude that they

Correct AnswerverifiedShow Answer

Serological testing is used for screening bacterial isolates for similarities.

Correct AnswerverifiedShow Answer

The highest level in the current taxonomic hierarchy is ʺKingdom.ʺ

Correct AnswerverifiedShow Answer

Serological testing is based on the fact that

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Which of the following statements is a reason for NOT classifying viruses in one of the three domains of life (Bacteria, Archaea, Eukarya) rather than in a fourth separate domain?

Correct AnswerverifiedB

Correct Answer
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Correct Answer
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True

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C

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B