Question 1

The structures often present in cells of obligate chemolithotrophs and which contain high levels of Calvin cycle enzymes (such as RuBisCO) are known as

Accepted Answer

A)  lysosomes. 
B)  carboxysomes. 
C)  inclusion bodies. 
D)  peroxisomes.

Question 2

Mud, lake water, or a sewage sample inoculated into mineral salts medium supplemented with an organic acid as the carbon source, lacking fixed or organic nitrogen, and incubated anoxically in the light invariably selects for

Accepted Answer

A)  purple nonsulfur bacteria. 
B)  purple sulfur bacteria. 
C)  nitrifying bacteria. 
D)  green nonsulfur bacteria.

Question 3

Methane produced in the anoxic regions of lakes rises through the water column, and methanotrophs are often concentrated in a narrow range at the interface of ________and________in the water.

Accepted Answer

The answer of Methane produced in the anoxic regions of...

Question 4

A gram- negative, nonsporulating rod that is highly motile, oxidase negative, facultatively aerobic, ferments glucose, and urease positive is likely to be of which genus?

Accepted Answer

A)  Rickettsia 
B)  Pseudomonas 
C)  Lactobacillus 
D)  Proteus

Question 5

Most bioluminescent bacteria are found in marine environments.

Accepted Answer

A) True 
 B)False

Question 6

Cytoplasmic extrusions can minimize sinking of aquatic bacteria that possess them.

Accepted Answer

A) True 
 B)False

Question 7

The metal________ must be present in the medium for chemolithotrophic growth of hydrogen bacteria because virtually all hydrogenases contain the ion ________as a metal cofactor.

Accepted Answer

The answer of The metal________ must be present in the...

Question 8

Members of the genus ________can be isolated from the intestines of homeothermic animals (such as humans) and poikilothermic animals (such as lizards and turtles).

Accepted Answer

The answer of Members of the genus ________can be isolated...

Question 9

Type I methanotrophs

Accepted Answer

A)  possess bundles of disc- shaped vesicles in internal membranes. 
B)  are obligate aerobes. 
C)  use the ribulose monophosphate cycle. 
D)  do all of the above.

Question 10

Explain the significant ecological role played by carboxydotrophic bacteria.

Accepted Answer

The answer of Explain the significant ecological role played by...

Question 11

Which of the following does NOT apply to Bdellovibrio?

Accepted Answer

A)  replicates in periplasmic space 
B)  obligate aerobe 
C)  widespread in soil and water 
D)  attacks gram- positive Bacteria

Question 12

Proteobacteria are all gram- negative.

Accepted Answer

A) True 
 B)False

Question 13

Organisms that can grow using carbon compounds lacking C- C bonds are called methylotrophs.

Accepted Answer

A) True 
 B)False

Question 14

Discuss the mechanism of motility and the unique morphology of the spirochetes.

Accepted Answer

The answer of Discuss the mechanism of motility and the...

Question 15

________constitute the majority of known bacteria of medical, industrial, and agricultural significance.

Accepted Answer

The answer of ________constitute the majority of known bacteria of...

Question 16

Pseudomonas aeruginosa is naturally resistant to many of the widely used antibiotics due to the presence of a(n)________ .

Accepted Answer

The answer of Pseudomonas aeruginosa is naturally resistant to many...

Question 17

Scientists studying bioremediation often use environmental strains of ________ that is capable of breaking down pesticides and other toxic chemicals.

Accepted Answer

A)  Bacillus 
B)  Clostridium 
C)  Staphylococcus 
D)  Pseudomonas

Question 18

The least derived (or most ancient) phylum contains the genus

Accepted Answer

A)  Propionibacterium. 
B)  Methylococcus. 
C)  Rhodospirillum. 
D)  Aquifex.

Question 19

Strains of which genus have had c70% of their genomes hybridized with Escherichia coli?

Accepted Answer

A)  Proteus 
B)  Salmonella 
C)  Shigella 
D)  Campylobacter

Question 20

Which of the following is NOT correct regarding ammonia oxidation by nitrifying bacteria?

Accepted Answer

A)  The substrate is NH4+. 
B)  Ammonia monooxygenase is located in an internal membrane system that resembles the photosynthetic membranes in the purple phototrophic bacteria. 
C)  The initial step involves an ammonia monooxygenase. 
D)  The oxidation occurs best in waters that receive inputs of sewage or other wastewaters.

Exam 17: Bacteria: the Proteobacteria

The structures often present in cells of obligate chemolithotrophs and which contain high levels of Calvin cycle enzymes (such as RuBisCO) are known as

Mud, lake water, or a sewage sample inoculated into mineral salts medium supplemented with an organic acid as the carbon source, lacking fixed or organic nitrogen, and incubated anoxically in the light invariably selects for

Methane produced in the anoxic regions of lakes rises through the water column, and methanotrophs are often concentrated in a narrow range at the interface of andin the water.

A gram- negative, nonsporulating rod that is highly motile, oxidase negative, facultatively aerobic, ferments glucose, and urease positive is likely to be of which genus?

Most bioluminescent bacteria are found in marine environments.

Cytoplasmic extrusions can minimize sinking of aquatic bacteria that possess them.

The metal must be present in the medium for chemolithotrophic growth of hydrogen bacteria because virtually all hydrogenases contain the ion as a metal cofactor.

Members of the genus ________can be isolated from the intestines of homeothermic animals (such as humans) and poikilothermic animals (such as lizards and turtles).

Type I methanotrophs

Explain the significant ecological role played by carboxydotrophic bacteria.

Which of the following does NOT apply to Bdellovibrio?

Proteobacteria are all gram- negative.

Organisms that can grow using carbon compounds lacking C- C bonds are called methylotrophs.

Discuss the mechanism of motility and the unique morphology of the spirochetes.

________constitute the majority of known bacteria of medical, industrial, and agricultural significance.

Pseudomonas aeruginosa is naturally resistant to many of the widely used antibiotics due to the presence of a(n)________ .

Scientists studying bioremediation often use environmental strains of ________ that is capable of breaking down pesticides and other toxic chemicals.

The least derived (or most ancient) phylum contains the genus

Strains of which genus have had c70% of their genomes hybridized with Escherichia coli?

Which of the following is NOT correct regarding ammonia oxidation by nitrifying bacteria?