Question 1

Replacing sodium with potassium can satisfy the requirement for sodium in the halobacteria.

Accepted Answer

A) True 
 B)False  False

Question 2

The presence of genes encoding RubisCO enzymes in Methanocaldococcus jannaschii and a species of Pyrococcus indicates that the organisms

Accepted Answer

A)  incorporate carbon dioxide via the reverse citric acid cycle. 
B)  incorporate carbon dioxide via the acetyl- CoA pathway. 
C)  utilize molecular hydrogen as an electron donor in chemolithotrophic metabolism. 
D)  incorporate carbon dioxide via the Calvin cycle. 
A)  incorporate carbon dioxide via the reverse citric acid cycle. 
B)  incorporate carbon dioxide via the acetyl- CoA pathway. 
C)  utilize molecular hydrogen as an electron donor in chemolithotrophic metabolism. 
D)  incorporate carbon dioxide via the Calvin cycle. D

Question 3

Which of the following are NOT substrates for methanogens?

Accepted Answer

A)  methanol, methylamine, and methylmercaptan 
B)  glucose and sucrose 
C)  carbon dioxide, carbon monoxide, and formate 
D)  acetate and pyruvate 
A)  methanol, methylamine, and methylmercaptan 
B)  glucose and sucrose 
C)  carbon dioxide, carbon monoxide, and formate 
D)  acetate and pyruvate B

Question 4

The cytoplasmic membrane of Thermoplasma contains a lipopolysaccharide- like material called_________ , which consists of a(n)_________ lipid monolayer membrane containing
and sugars.

Accepted Answer

lipoglycan / tetraet

Question 5

Archaea is divided into three phyla.

Accepted Answer

A) True 
 B)False

Question 6

Thermoplasma grows either aerobically or anaerobically by sulfur respiration.

Accepted Answer

A) True 
 B)False

Question 7

Which of the following bioenergetic processes CANNOT occur in hyperthermophiles?

Accepted Answer

A)  photosynthesis 
B)  chemolithotrophy 
C)  chemoorganotrophy 
D)  all of the above 
A)  photosynthesis 
B)  chemolithotrophy 
C)  chemoorganotrophy 
D)  all of the above

Question 8

Which statement is NOT correct regarding Ferroglobus?

Accepted Answer

A)  Ferroglobus is a sulfate- reducing bacterium. 
B)  Ferroglobus was isolated from a shallow marine hydrothermal vent. 
C)  Ferroglobus can use H2 or H2S as electron donors in its energy metabolism. 
D)  Ferroglobus is an iron- oxidizing chemolithotrophic autotroph. 
A)  Ferroglobus is a sulfate- reducing bacterium. 
B)  Ferroglobus was isolated from a shallow marine hydrothermal vent. 
C)  Ferroglobus can use H2 or H2S as electron donors in its energy metabolism. 
D)  Ferroglobus is an iron- oxidizing chemolithotrophic autotroph.

Question 9

Which microbial grouping is the major oxygenic phototroph in most salt lakes?

Accepted Answer

A)  Dunaliella, a eukaryotic alga 
B)  halophilic Archaea 
C)  cyanobacteria 
D)  purple nonsulfur bacteria 
A)  Dunaliella, a eukaryotic alga 
B)  halophilic Archaea 
C)  cyanobacteria 
D)  purple nonsulfur bacteria

Question 10

The factor that MOST affects the thermostability of a protein is its

Accepted Answer

A)  folding pattern. 
B)  highly hydrophobic core regions. 
C)  number of hydrogen bonds. 
D)  ionic surface interactions. 
A)  folding pattern. 
B)  highly hydrophobic core regions. 
C)  number of hydrogen bonds. 
D)  ionic surface interactions.

Question 11

Some Archaea are chemoorganotrophs and use organic compounds as electron donors for energy metabolism.

Accepted Answer

A) True 
 B)False

Question 12

Where is the thermosome found, and what is its apparent role?

Accepted Answer

A thermosome is a complex containing cha

Question 13

Methanogenesis is coupled with proton motive force formation and ATP synthesis through the activity of ATPases.

Accepted Answer

A) True 
 B)False

Question 14

Within the archaeal order Thermoplasmatales, which genus is the most acidotolerant and can grow in an environment with a pH of less than 0?

Accepted Answer

A)  Ferroplasma 
B)  Aciduliprofundum 
C)  Picrophilus 
D)  Thermoplasma 
A)  Ferroplasma 
B)  Aciduliprofundum 
C)  Picrophilus 
D)  Thermoplasma

Question 15

The predominant cation in the Great Salt Lake is ________; the predominant cation in the Dead Sea is________ .

Accepted Answer

A)  magnesium / sodium 
B)  magnesium / magnesium 
C)  sodium / magnesium 
D)  sodium / sodium 
A)  magnesium / sodium 
B)  magnesium / magnesium 
C)  sodium / magnesium 
D)  sodium / sodium

Question 16

Compare and contrast the genera Thermoproteus and Pyrobaculum or Thermoproteales in terms of their physiology as well as locations from where they can be isolated.

Accepted Answer

Thermoproteus species are strict anaerob

Question 17

Many hyperthermophiles are chemolithoautotrophs.

Accepted Answer

A) True 
 B)False

Question 18

Nitrifying Archaea such as Nitrosopumilus maritimus use _________as a sole carbon source and are capable of obtaining sufficient energy by aerobically oxidizing_________ , despite its relatively low concentration in the open ocean.

Accepted Answer

The answer of Nitrifying Archaea such as Nitrosopumilus maritimus use...

Question 19

Detail the mechanism by which halophilic Archaea obtain energy from light.

Accepted Answer

Halobacteria have the ability to increas

Question 20

Thermoplasma survive in coal refuse piles, because these piles

Accepted Answer

A)  tend to self- heat by spontaneous combustion. 
B)  contain coal fragments and pyrite. 
C)  contain organic materials extracted from coal. 
D)  all of the above. 
A)  tend to self- heat by spontaneous combustion. 
B)  contain coal fragments and pyrite. 
C)  contain organic materials extracted from coal. 
D)  all of the above.

Exam 19: Archaea

Replacing sodium with potassium can satisfy the requirement for sodium in the halobacteria.

The presence of genes encoding RubisCO enzymes in Methanocaldococcus jannaschii and a species of Pyrococcus indicates that the organisms

Which of the following are NOT substrates for methanogens?

The cytoplasmic membrane of Thermoplasma contains a lipopolysaccharide- like material called_________ , which consists of a(n)_________ lipid monolayer membrane containing and sugars.

Archaea is divided into three phyla.

Thermoplasma grows either aerobically or anaerobically by sulfur respiration.

Which of the following bioenergetic processes CANNOT occur in hyperthermophiles?

Which statement is NOT correct regarding Ferroglobus?

Which microbial grouping is the major oxygenic phototroph in most salt lakes?

The factor that MOST affects the thermostability of a protein is its

Some Archaea are chemoorganotrophs and use organic compounds as electron donors for energy metabolism.

Where is the thermosome found, and what is its apparent role?

Methanogenesis is coupled with proton motive force formation and ATP synthesis through the activity of ATPases.

Within the archaeal order Thermoplasmatales, which genus is the most acidotolerant and can grow in an environment with a pH of less than 0?

The predominant cation in the Great Salt Lake is ________; the predominant cation in the Dead Sea is________ .

Compare and contrast the genera Thermoproteus and Pyrobaculum or Thermoproteales in terms of their physiology as well as locations from where they can be isolated.

Many hyperthermophiles are chemolithoautotrophs.

Nitrifying Archaea such as Nitrosopumilus maritimus use _________as a sole carbon source and are capable of obtaining sufficient energy by aerobically oxidizing_________ , despite its relatively low concentration in the open ocean.

Detail the mechanism by which halophilic Archaea obtain energy from light.

Thermoplasma survive in coal refuse piles, because these piles

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The cytoplasmic membrane of Thermoplasma contains a lipopolysaccharide- like material called_ , which consists of a(n)_ lipid monolayer membrane containing and sugars.

The predominant cation in the Great Salt Lake is ; the predominant cation in the Dead Sea is .

Nitrifying Archaea such as Nitrosopumilus maritimus use _as a sole carbon source and are capable of obtaining sufficient energy by aerobically oxidizing_ , despite its relatively low concentration in the open ocean.