Question 1

Which of the following is not one of Koch's postulates?

Accepted Answer

A)   The introduction of the microorganism to a new, healthy host causes the same disease that existed in the original host.
B)   The microorganism is always found in the person with the disease.
C)   after the microorganism is introduced into a healthy host who gets the disease, the same microorganism can be isolated from this patient.
D)   The microorganism is susceptible to antibiotic treatment.
E)   The microorganism can be isolated from an infected individual and grown in culture.F) C) and D)
G) A) and C)

Question 2

Archaea

Accepted Answer

A)   have cytoskeletons.
B)   have distinctive lipids in their plasma membranes.
C)   survive only at moderate temperatures and near neutrality.
D)   all produce methane.
E)   have substantial amounts of peptidoglycan in their cell walls.F) A) and B)
G) A) and C)

Question 3

Chlamydias

Accepted Answer

A)   can form heterocysts.
B)   form a branched, filamentous mycelium.
C)   contain less DNA than any other organism.
D)   can live only within the cells of other organisms.
E)   were once classified as fungi.F) B) and E)
G) A) and D)

Question 4

Cattle depend on prokaryotes to perform important steps in digestion of plant material, such as generating the enzyme

Accepted Answer

A)   amylase.
B)   cellulase.
C)   kinase.
D)   telomerase.
E)   glyoxalase.F) A) and B)
G) A) and C)

Question 5

Eukarya are evolutionarily closer to _______ than they are to Bacteria.

Accepted Answer

The answer of Eukarya are evolutionarily closer to _______ than...

Question 6

Which of the following groups of bacteria has the highest proportion of pathogens?

Accepted Answer

A)   Proteobacteria
B)   Cyanobacteria
C)   Chlamydias
D)   High-GC Gram-positives
E)   Low-GC Gram-positivesF) B) and E)
G) B) and D)

Question 7

Double-stranded RNA viruses

Accepted Answer

A)   have only a few genes, including one that allows them to make mRNA from their genome.
B)   are responsible for causing plant diseases and are referred to as mosaic viruses.
C)   regenerate themselves by reverse transcription.
D)   are polyphyletic and include some that have more than a million base pairs.
E)   have distinct lipids in their plasma membranes.F) B) and D)
G) A) and B)

Question 8

Which of the following does not describe the biofilm found in the human large intestine?

Accepted Answer

A)   It is a dangerous combination of different species of toxic bacteria.
B)   It facilitates nutrient transfer from the intestine to the body.
C)   It is essential for our health.
D)   Its exact species makeup varies from region to region.
E)   Humans get vitamins B12 and K from the bacterial waste products.F) B) and E)
G) A) and C)

Question 9

The size of the smallest bacterium is _______  μ\muμ m.

Accepted Answer

A)   0.2
B)   2
C)   7.5
D)   75
E)   750 F) B) and E)
G) A) and B)

Question 10

Archaea are more closely related to _______ than to any other monophyletic group.

Accepted Answer

A)   bacteria
B)   eukaryotes
C)   bacteria and eukaryotes
D)   fungi
E)   protistsF) B) and C)
G) A) and E)

Question 11

Gram-negative bacteria stain pink because

Accepted Answer

A)   they have specialized lipids in their cell walls.
B)   their peptidoglycan layer is thin.
C)   their peptidoglycan layer is thick.
D)   they are receptive to antibiotics.
E)   their cell walls are composed largely of proteins.F) A) and D)
G) C) and D)

Question 12

Positive-sense single-stranded RNA viruses

Accepted Answer

A)   have only a few genes, including one that allows them to make mRNA from their genome.
B)   are responsible for causing plant diseases and are referred to as mosaic viruses.
C)   regenerate themselves by reverse transcription.
D)   are polyphyletic and include some that have more than a million base pairs.
E)   have distinct lipids in their plasma membranes.F) C) and D)
G) D) and E)

Question 13

Bacteria are known for the many roles they play in biological communities. Which of the following is the rarest role for this group of organisms?

Accepted Answer

A)   Pathogen
B)   Digestive aid
C)   Nitrogen and sulfur processor in soils
D)   Decomposer
E)   Industry and agricultural useF) A) and D)
G) C) and D)

Question 14

As a U.S. Department of Agriculture field representative, you counsel a young farmer to plant alfalfa in fields with soils that have low nitrogen levels. You know alfalfa roots are hosts for nitrogen-fixing bacteria. How will the alfalfa and its associated bacteria help "fertilize" this farmer's soil?

Accepted Answer

Nitrogen-fixing bacteria can convert atm...

Question 15

Which of the following statements regarding the suitability of ribosomal RNA (rRNA)  nucleotide sequences for phylogenetic analysis of prokaryotes is false?

Accepted Answer

A)   It is suitable because rRNA is present in all free-living organisms.
B)   It is suitable because rRNA performs the same function in all organisms.
C)   It is suitable because rRNA has evolved relatively slowly.
D)   It is suitable because rRNA is relatively recent on the evolutionary time scale.
E)   It is suitable because rRNA is ancient on the evolutionary time scale.F) C) and D)
G) B) and C)

Question 16

Which statement about archaeal genomes is true?

Accepted Answer

A)   They are typically organized in a circular chromosome, like bacterial genomes.
B)   They include no rRNA genes.
C)   They are always much smaller than bacterial genomes.
D)   They are housed in the nucleus of the archaeal cell.
E)   No archaeal genome has yet been sequenced.F) B) and E)
G) B) and C)

Exam 26: Bacteria and Archaea: the Prokaryotic Domains

Archaea

Correct Answer
verified

Eukarya are evolutionarily closer to _______ than they are to Bacteria.

Correct Answer
verified

Which of the following groups of bacteria has the highest proportion of pathogens?

Correct Answer
verified

Which statement about archaeal genomes is true?

Correct Answer
verified

Bacteria are known for the many roles they play in biological communities. Which of the following is the rarest role for this group of organisms?

Correct Answer
verified

Gram-negative bacteria stain pink because

Correct Answer
verified

Positive-sense single-stranded RNA viruses

Correct Answer
verified

Archaea are more closely related to _______ than to any other monophyletic group.

Correct Answer
verified

The size of the smallest bacterium is _______ $\mu$ m.

Correct Answer
verified

Which of the following does not describe the biofilm found in the human large intestine?

Correct Answer
verified

Cattle depend on prokaryotes to perform important steps in digestion of plant material, such as generating the enzyme

Correct Answer
verified

Double-stranded RNA viruses

Correct Answer
verified

Chlamydias

Correct Answer
verified

Which of the following is not one of Koch's postulates?

Correct Answer
verified

Correct Answer
verified
Nitrogen-fixing bacteria can convert atm...
View Answer

Which of the following statements regarding the suitability of ribosomal RNA (rRNA) nucleotide sequences for phylogenetic analysis of prokaryotes is false?

Correct Answer
verified

Exam 26: Bacteria and Archaea: the Prokaryotic Domains

Archaea

Correct AnswerverifiedShow Answer

Eukarya are evolutionarily closer to _______ than they are to Bacteria.

Correct AnswerverifiedShow Answer

Which of the following groups of bacteria has the highest proportion of pathogens?

Correct AnswerverifiedShow Answer

Which statement about archaeal genomes is true?

Correct AnswerverifiedShow Answer

Bacteria are known for the many roles they play in biological communities. Which of the following is the rarest role for this group of organisms?

Correct AnswerverifiedShow Answer

Gram-negative bacteria stain pink because

Correct AnswerverifiedShow Answer

Positive-sense single-stranded RNA viruses

Correct AnswerverifiedShow Answer

Archaea are more closely related to _______ than to any other monophyletic group.

Correct AnswerverifiedShow Answer

The size of the smallest bacterium is _______ μ\muμ m.

Correct AnswerverifiedShow Answer

Which of the following does not describe the biofilm found in the human large intestine?

Correct AnswerverifiedShow Answer

Cattle depend on prokaryotes to perform important steps in digestion of plant material, such as generating the enzyme

Correct AnswerverifiedShow Answer

Double-stranded RNA viruses

Correct AnswerverifiedShow Answer

Chlamydias

Correct AnswerverifiedShow Answer

Which of the following is not one of Koch's postulates?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedNitrogen-fixing bacteria can convert atm...View AnswerShow Answer

Which of the following statements regarding the suitability of ribosomal RNA (rRNA) nucleotide sequences for phylogenetic analysis of prokaryotes is false?

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

The size of the smallest bacterium is _______ $\mu$ m.

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
Nitrogen-fixing bacteria can convert atm...
View Answer

Correct Answer
verified