Question 1

__________ influence the fermentation efficiency of the gut flora.

Accepted Answer

A)   Pathogens
B)   Bacteria
C)   Eukarya
D)   Methanogens
E)   HalophilesF) All of the above
G) A) and D)

Question 2

The __________ domain lacks pathogens.

Accepted Answer

A)   eukarya
B)   bacteria
C)   archaeal
D)   protist
E)   moneraF) A) and E)
G) B) and D)

Question 3

Methanogenesis includes a unique pathway of carbon fixation, called the carbon monoxide __________ pathway, because the key enzyme can fix CO as well as CO2.

Accepted Answer

A)   gyrase
B)   helicase
C)   polymerase
D)   reductase
E)   dismutaseF) B) and E)
G) A) and D)

Question 4

Discuss the genome and morphology of known archaeal viruses. Why are their genomes all similar in structure?

Accepted Answer

All known archaeal viruses have double-s...

Question 5

Describe some of the unique metabolic pathways found in Archaea but not Bacteria or Eukarya.

Accepted Answer

Some Archaea use unique variations of th...

Question 6

If archaea are distinct from bacteria, why is the major haloarchaeal order called Halobacteriales and why do most contain bacteriorhodopsin?

Accepted Answer

The order was named before the archaea w...

Question 7

Where are methanogens found in nature? What are some of the problems they can cause in these habitats?

Accepted Answer

Methanogens are found in wetland soil an...

Question 8

In the haloarchaea, the red pigment bacterioruberin protects cells from damage by __________.

Accepted Answer

A)   light
B)   salt
C)   heat
D)   acid
E)   coldF) B) and E)
G) A) and E)

Question 9

The major environmental location of methanogens is:

Accepted Answer

A)   landfills
B)   ruminant digestive tracts
C)   human digestive tracts
D)   anaerobic wetlands soil
E)   marine floor sedimentF) B) and E)
G) B) and D)

Question 10

Methanogens are classified within how many orders?

Accepted Answer

A)   one
B)   two
C)   three
D)   four
E)   fiveF) B) and C)
G) C) and D)

Question 11

The Haloarchaea, extreme __________, are the only form of life to grow in concentrated brine.

Accepted Answer

A)   thermophiles
B)   psychrophiles
C)   methanophiles
D)   halophiles
E)   acidophilesF) A) and E)
G) A) and D)

Question 12

__________ is sensitive to penicillin.

Accepted Answer

A)   Peptidoglycan
B)   Pseudopeptidoglycan
C)   S-layer
D)   Protein cell wall
E)   all of the aboveF) A) and E)
G) B) and D)

Question 13

Members of the __________ possess no cell wall at all.

Accepted Answer

A)   Euryarchaeota
B)   Crenarchaeota
C)   Korarchaeota
D)   Nanoarchaeota
E)   HalophilesF) B) and C)
G) A) and D)

Question 14

All of the rhodopsins in the haloarchaeotes have how many alpha helical transmembrane domains?

Accepted Answer

A)   one
B)   three
C)   five
D)   seven
E)   nineF) A) and B)
G) None of the above

Question 15

Archaeal membranes contain __________ lipid side chains.

Accepted Answer

A)   glycoprotein
B)   retinal
C)   isoprenoid
D)   diether
E)   esterF) C) and D)
G) A) and C)

Question 16

Describe the physiological adaptations found in haloarchaea that compensate for the high internal potassium chloride concentrations.

Accepted Answer

Most of the haloarchaea have a GC conten...

Question 17

Commercial evaporation pools for salt production benefit from the presence of red __________, whose light absorption accelerates heating and evaporation.

Accepted Answer

A)   methanogens
B)   Sulfolobus
C)   acidophiles
D)   haloarchaea
E)   thermophilesF) A) and B)
G) A) and C)

Question 18

Some archaea contain genomes with positive superturns generated by __________, which protect DNA from extreme acid.

Accepted Answer

A)   helicase
B)   polymerase
C)   primase
D)   reductase
E)   reverse gyraseF) A) and C)
G) C) and E)

Question 19

Haloarchaea can regulate their buoyancy through the production of __________.

Accepted Answer

A)   contractile vacuoles
B)   pigments
C)   salt
D)   gas vesicles
E)   carbon dioxideF) B) and D)
G) A) and D)

Question 20

Which of the following classes contains organisms that are psychrophiles?

Accepted Answer

A)   Thermoprotei
B)   Thermococci
C)   Thermoplasmata
D)   all of the above
E)   none of the aboveF) D) and E)
G) A) and E)

Exam 19: Archaeal Diversity

__________ is sensitive to penicillin.

Correct AnswerverifiedShow Answer

Commercial evaporation pools for salt production benefit from the presence of red __________, whose light absorption accelerates heating and evaporation.

Correct AnswerverifiedShow Answer

Methanogenesis includes a unique pathway of carbon fixation, called the carbon monoxide __________ pathway, because the key enzyme can fix CO as well as CO2.

Correct AnswerverifiedShow Answer

Haloarchaea can regulate their buoyancy through the production of __________.

Correct AnswerverifiedShow Answer

The major environmental location of methanogens is:

Correct AnswerverifiedShow Answer

Where are methanogens found in nature? What are some of the problems they can cause in these habitats?

Correct AnswerverifiedMethanogens are found in wetland soil an...View AnswerShow Answer

The __________ domain lacks pathogens.

Correct AnswerverifiedShow Answer

Members of the __________ possess no cell wall at all.

Correct AnswerverifiedShow Answer

Some archaea contain genomes with positive superturns generated by __________, which protect DNA from extreme acid.

Correct AnswerverifiedShow Answer

In the haloarchaea, the red pigment bacterioruberin protects cells from damage by __________.

Correct AnswerverifiedShow Answer

The Haloarchaea, extreme __________, are the only form of life to grow in concentrated brine.

Correct AnswerverifiedShow Answer

All of the rhodopsins in the haloarchaeotes have how many alpha helical transmembrane domains?

Correct AnswerverifiedShow Answer

Methanogens are classified within how many orders?

Correct AnswerverifiedShow Answer

If archaea are distinct from bacteria, why is the major haloarchaeal order called Halobacteriales and why do most contain bacteriorhodopsin?

Correct AnswerverifiedThe order was named before the archaea w...View AnswerShow Answer

__________ influence the fermentation efficiency of the gut flora.

Correct AnswerverifiedShow Answer

Describe some of the unique metabolic pathways found in Archaea but not Bacteria or Eukarya.

Correct AnswerverifiedSome Archaea use unique variations of th...View AnswerShow Answer

Archaeal membranes contain __________ lipid side chains.

Correct AnswerverifiedShow Answer

Discuss the genome and morphology of known archaeal viruses. Why are their genomes all similar in structure?

Correct AnswerverifiedAll known archaeal viruses have double-s...View AnswerShow Answer

Which of the following classes contains organisms that are psychrophiles?

Correct AnswerverifiedShow Answer

Describe the physiological adaptations found in haloarchaea that compensate for the high internal potassium chloride concentrations.

Correct AnswerverifiedMost of the haloarchaea have a GC conten...View AnswerShow Answer

Correct Answer
verified

Correct Answer
verified

Methanogenesis includes a unique pathway of carbon fixation, called the carbon monoxide __________ pathway, because the key enzyme can fix CO as well as CO₂.

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
Methanogens are found in wetland soil an...
View 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 order was named before the archaea w...
View Answer

Correct Answer
verified

Correct Answer
verified
Some Archaea use unique variations of th...
View Answer

Correct Answer
verified

Correct Answer
verified
All known archaeal viruses have double-s...
View Answer

Correct Answer
verified

Correct Answer
verified
Most of the haloarchaea have a GC conten...
View Answer