Question 1

Unlike other prokaryotes,archaeons (except Sulfolobus)have two origins of replication.

Accepted Answer

A) True 
 B)False

Question 2

Which of the following is true about the cell-wall-less archaeal genus Thermoplasma?

Accepted Answer

A)  They are spherical at temperatures below 59 °\degree° C.
B)  They are filamentous at temperatures at 59 °\degree° C and higher.
C)  They are non-motile.
D)  They are spherical at temperatures below 59 °\degree° C and they are filamentous at temperatures at 59 °\degree° C and higher.ASM E) A) and B)
F) C) and D)

Question 3

Which of the following do methanogens not use to form methane?

Accepted Answer

A)  carbon dioxide
B)  formate
C)  acetate
D)  phosphateE) C) and D)
F) A) and B)

Question 4

Diglycerol tetraether lipids

Accepted Answer

A)  are a characteristic feature of thermophilic Archaea.
B)  tend to make the membrane less rigid.
C)  are found in some bacteria and some Archaea.
D)  form typical bilayer membranes in thermophilic Archaea of the genus Thermoplasma.E) B) and C)
F) None of the above

Question 5

Which of the following is currently the largest group of cultured Archaea?

Accepted Answer

A)  extreme halophiles
B)  methanogens
C)  extreme thermophiles
D)  sulfate reducersE) B) and D)
F) A) and C)

Question 6

Archaeoglobales have been isolated from marine hydrothermal vents.

Accepted Answer

A) True 
 B)False

Question 7

Substrates used by methanogens include H2 and CO2 as well as short-chain organic compounds such as

Accepted Answer

A)  formate.
B)  acetate.
C)  methanol.
D)  all of the above are used by methanogens.E) A) and C)
F) A) and D)

Question 8

The Crenarchaeota and Euryarchaeota are

Accepted Answer

A)  the two phyla of the Archaea.
B)  very closely related based on 16S rRNA comparisons.
C)  photosynthetic Archaea.
D)  now classified with the bacteria based on genomic sequence analysis.E) A) and B)
F) All of the above

Question 9

Which of the following do methanogens not use to form methane?

Accepted Answer

A)  carbon dioxide
B)  formate
C)  acetate
D)  phosphateE) A) and B)
F) B) and C)

Question 10

Methanogenic Archaea are

Accepted Answer

A)  obligate anaerobes that produce methane.
B)  obligate anaerobes that consume methane.
C)  obligate aerobes that produce methane.
D)  obligate aerobes that consume methane.E) B) and C)
F) A) and D)

Question 11

The primary lipid components of the membranes of extreme thermophiles are

Accepted Answer

A)  sulfolipids.
B)  cholesterol.
C)  40 carbon diglycerol tetraethers.
D)  20 carbon diglycerol diethers.E) None of the above
F) A) and B)

Question 12

Archaeons have been isolated from temperate and cold environments.

Accepted Answer

A) True 
 B)False

Question 13

Autotrophy has been observed among the

Accepted Answer

A)  methanogens.
B)  extreme thermophiles.
C)  cyanobacteria.
D)  all of the choicesE) B) and C)
F) A) and B)

Question 14

Some archaeons are symbionts in animal digestive tracts.

Accepted Answer

A) True 
 B)False

Question 15

An organism that requires at least 1.5 M NaCl in order to grow is referred to as a(n)

Accepted Answer

A)  facultative halophile.
B)  extreme halophile.
C)  sodiophile.
D)  barophile.E) C) and D)
F) A) and D)

Question 16

Most Archaea capable of metabolizing glucose do so using a modified _________________ pathway.

Accepted Answer

The answer of Most Archaea capable of metabolizing glucose do...

Question 17

Archaeal promoters are most similar to those of

Accepted Answer

A)  viruses.
B)  bacteria.
C)  eukaryotes.
D)  both viruses and bacteria.E) B) and C)
F) C) and D)

Question 18

Which of the following contribute(s) to the differences between the Archaea and the bacteria?

Accepted Answer

A)  Archaea lack muramic acid.
B)  Archaea have isopranyl glycerol ethers rather than fatty acid esters in their membrane lipids.
C)  Archaea differ from bacteria in their tRNA composition,ribosome structure,and antibiotic sensitivity.
D)  all of these.E) A) and B)
F) None of the above

Exam 20: The Archaea

Archaeoglobales have been isolated from marine hydrothermal vents.

Correct Answer
verified

Which of the following is currently the largest group of cultured Archaea?

Correct Answer
verified

Some archaeons are symbionts in animal digestive tracts.

Correct Answer
verified

Autotrophy has been observed among the

Correct Answer
verified

Archaeal promoters are most similar to those of

Correct Answer
verified

Most Archaea capable of metabolizing glucose do so using a modified _________________ pathway.

Correct Answer
verified

Which of the following do methanogens not use to form methane?

Correct Answer
verified

An organism that requires at least 1.5 M NaCl in order to grow is referred to as a(n)

Correct Answer
verified

Which of the following is true about the cell-wall-less archaeal genus Thermoplasma?

Correct Answer
verified

Unlike other prokaryotes,archaeons (except Sulfolobus)have two origins of replication.

Correct Answer
verified

Substrates used by methanogens include H₂ and CO₂ as well as short-chain organic compounds such as

Correct Answer
verified

The Crenarchaeota and Euryarchaeota are

Correct Answer
verified

Which of the following do methanogens not use to form methane?

Correct Answer
verified

Methanogenic Archaea are

Correct Answer
verified

The primary lipid components of the membranes of extreme thermophiles are

Correct Answer
verified

Which of the following contribute(s) to the differences between the Archaea and the bacteria?

Correct Answer
verified

Diglycerol tetraether lipids

Correct Answer
verified

Archaeons have been isolated from temperate and cold environments.

Correct Answer
verified

Exam 20: The Archaea

Archaeoglobales have been isolated from marine hydrothermal vents.

Correct AnswerverifiedShow Answer

Which of the following is currently the largest group of cultured Archaea?

Correct AnswerverifiedShow Answer

Some archaeons are symbionts in animal digestive tracts.

Correct AnswerverifiedShow Answer

Autotrophy has been observed among the

Correct AnswerverifiedShow Answer

Archaeal promoters are most similar to those of

Correct AnswerverifiedShow Answer

Most Archaea capable of metabolizing glucose do so using a modified _________________ pathway.

Correct AnswerverifiedShow Answer

Which of the following do methanogens not use to form methane?

Correct AnswerverifiedShow Answer

An organism that requires at least 1.5 M NaCl in order to grow is referred to as a(n)

Correct AnswerverifiedShow Answer

Which of the following is true about the cell-wall-less archaeal genus Thermoplasma?

Correct AnswerverifiedShow Answer

Unlike other prokaryotes,archaeons (except Sulfolobus)have two origins of replication.

Correct AnswerverifiedShow Answer

Substrates used by methanogens include H2 and CO2 as well as short-chain organic compounds such as

Correct AnswerverifiedShow Answer

The Crenarchaeota and Euryarchaeota are

Correct AnswerverifiedShow Answer

Which of the following do methanogens not use to form methane?

Correct AnswerverifiedShow Answer

Methanogenic Archaea are

Correct AnswerverifiedShow Answer

The primary lipid components of the membranes of extreme thermophiles are

Correct AnswerverifiedShow Answer

Which of the following contribute(s) to the differences between the Archaea and the bacteria?

Correct AnswerverifiedShow Answer

Diglycerol tetraether lipids

Correct AnswerverifiedShow Answer

Archaeons have been isolated from temperate and cold environments.

Correct AnswerverifiedShow Answer

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Substrates used by methanogens include H₂ and CO₂ as well as short-chain organic compounds such as

Correct Answer
verified

Correct Answer
verified

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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