Question 1

Describe two possible explanations for the deep branching position of multiple methanogenic clades in the euryarchaeotes.

Accepted Answer

Two possible explanations of this phylog

Question 2

Archaeosine is a guanosine analog found in archaeal

Accepted Answer

A)  rRNA. 
B)  mRNA. 
C)  DNA. 
D)  msRNA. 
E)  tRNA. 
A)  rRNA. 
B)  mRNA. 
C)  DNA. 
D)  msRNA. 
E)  tRNA.

Question 3

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 4

Which of the following Crenarchaeota grows as disks linked by cannulae?

Accepted Answer

A)  Aeropyrum pernix 
B)  Desulfurococcus mobilis 
C)  Ignicoccus islandicus 
D)  Thermosphaera aggregans 
E)  Pyrodictium brockii 
A)  Aeropyrum pernix 
B)  Desulfurococcus mobilis 
C)  Ignicoccus islandicus 
D)  Thermosphaera aggregans 
E)  Pyrodictium brockii

Question 5

The energy-yielding process of ________ occurs only in the archaea.

Accepted Answer

A)  fermentation 
B)  sulfur oxidation 
C)  hydrogen oxidation 
D)  methanogenesis 
E)  anaerobic respiration 
A)  fermentation 
B)  sulfur oxidation 
C)  hydrogen oxidation 
D)  methanogenesis 
E)  anaerobic respiration

Question 6

Which of the following uses light to generate a proton gradient in the haloarchaeotes?

Accepted Answer

A)  bacteriorhodopsin 
B)  bacterioruberin 
C)  halorhodopsin 
D)  methanofuran 
E)  ferredoxin 
A)  bacteriorhodopsin 
B)  bacterioruberin 
C)  halorhodopsin 
D)  methanofuran 
E)  ferredoxin

Question 7

If a species of Ferroplasma is cultured on pyrite ore, what will they do to their surrounding environment?

Accepted Answer

Ferroplasma use dissolved Fe³⁺ as an oxi

Question 8

What is the function of the device shown in the following figure? Describe what major challenges this instrument overcomes.

Accepted Answer

The device is known as the "Deep Aquariu

Question 9

Which of the following species is aerobic?

Accepted Answer

A)  Aeropyrum 
B)  Thermococci 
C)  Thermosphera 
D)  Pyrococcus 
E)  Sulfolobus 
A)  Aeropyrum 
B)  Thermococci 
C)  Thermosphera 
D)  Pyrococcus 
E)  Sulfolobus

Question 10

The Sulfolobus species maintains an internal pH ________ that of its habitat.

Accepted Answer

A)  equivalent to 
B)  higher than 
C)  lower than 
D)  variable enough that it cannot be measured against 
E)  not determined to be different to 
A)  equivalent to 
B)  higher than 
C)  lower than 
D)  variable enough that it cannot be measured against 
E)  not determined to be different to

Question 11

What are some of the unique features of archaeal gene regulation?

Accepted Answer

The genes encoding most archaeal protein

Question 12

In methanogenesis from CO₂ and H₂, the initial incorporation of H₂ requires a coupled gradient of which ion?

Accepted Answer

A)  sodium 
B)  potassium 
C)  iron 
D)  magnesium 
E)  molybdenum 
A)  sodium 
B)  potassium 
C)  iron 
D)  magnesium 
E)  molybdenum

Question 13

With respect to pH, the ________ show the widest range of any clade.

Accepted Answer

A)  crenarchaeotes 
B)  euryarchaeotes 
C)  Ancient Archaeal Group 
D)  nanoarchaeotes 
E)  methanogens 
A)  crenarchaeotes 
B)  euryarchaeotes 
C)  Ancient Archaeal Group 
D)  nanoarchaeotes 
E)  methanogens

Question 14

The thaumarcheal ammonia oxidizers contribute to the global cycling of

Accepted Answer

A)  phosphorus. 
B)  nitrogen. 
C)  sulfur. 
D)  oxygen. 
E)  hydrogen. 
A)  phosphorus. 
B)  nitrogen. 
C)  sulfur. 
D)  oxygen. 
E)  hydrogen.

Question 15

Most organisms of the order ________ lack both a cell wall and an S-layer.

Accepted Answer

A)  Archaeoglobales 
B)  Thermoplasmatales 
C)  Halobacteriales 
D)  Methanobacteriales 
E)  Methanococcales 
A)  Archaeoglobales 
B)  Thermoplasmatales 
C)  Halobacteriales 
D)  Methanobacteriales 
E)  Methanococcales

Question 16

Members of order ________ in the human gut may couple with methanogens to provide the hydrogen gas for methanogenesis.

Accepted Answer

A)  Desulfurococcales 
B)  Thermococcales 
C)  Clostridiales 
D)  Rhizobiales 
E)  Enterobacteriales 
A)  Desulfurococcales 
B)  Thermococcales 
C)  Clostridiales 
D)  Rhizobiales 
E)  Enterobacteriales

Question 17

Which organism has a periplasmic space containing membrane vesicles?

Accepted Answer

A)  Desulfurococcus sp. 
B)  Ignicoccus sp. 
C)  Methanosarcina sp. 
D)  Methanothermus sp. 
E)  Pyrodictium sp. 
A)  Desulfurococcus sp. 
B)  Ignicoccus sp. 
C)  Methanosarcina sp. 
D)  Methanothermus sp. 
E)  Pyrodictium sp.

Question 18

Pyrodictium species grow as networks interconnected by glycoprotein tubules called

Accepted Answer

A)  cannulae. 
B)  pili. 
C)  fimbriae. 
D)  flagella. 
E)  actin filaments. 
A)  cannulae. 
B)  pili. 
C)  fimbriae. 
D)  flagella. 
E)  actin filaments.

Question 19

Thermococcales can utilize elemental sulfur as a terminal electron acceptor for anaerobic respiration, yielding ________ as a by-product.

Accepted Answer

A)  H₂SO₄ 
B)  S0 
C)  H₂S 
D)  thiosulfate 
E)  ammonia 
A)  H₂SO₄ 
B)  S0 
C)  H₂S 
D)  thiosulfate 
E)  ammonia

Question 20

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)  nine 
A)  one 
B)  three 
C)  five 
D)  seven 
E)  nine

Exam 19: Archaeal Diversity

Describe two possible explanations for the deep branching position of multiple methanogenic clades in the euryarchaeotes.

Archaeosine is a guanosine analog found in archaeal

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

Which of the following Crenarchaeota grows as disks linked by cannulae?

The energy-yielding process of ________ occurs only in the archaea.

Which of the following uses light to generate a proton gradient in the haloarchaeotes?

If a species of Ferroplasma is cultured on pyrite ore, what will they do to their surrounding environment?

What is the function of the device shown in the following figure? Describe what major challenges this instrument overcomes.

Which of the following species is aerobic?

The Sulfolobus species maintains an internal pH ________ that of its habitat.

What are some of the unique features of archaeal gene regulation?

In methanogenesis from CO₂ and H₂, the initial incorporation of H₂ requires a coupled gradient of which ion?

With respect to pH, the ________ show the widest range of any clade.

The thaumarcheal ammonia oxidizers contribute to the global cycling of

Most organisms of the order ________ lack both a cell wall and an S-layer.

Members of order ________ in the human gut may couple with methanogens to provide the hydrogen gas for methanogenesis.

Which organism has a periplasmic space containing membrane vesicles?

Pyrodictium species grow as networks interconnected by glycoprotein tubules called

Thermococcales can utilize elemental sulfur as a terminal electron acceptor for anaerobic respiration, yielding ________ as a by-product.

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

Microbial Life: Origin and Discovery

Observing the Microbial Cell

Cell Structure and Function

Bacterial Culture, Growth, and Development

Environmental Influences and Control of Microbial Growth

Viruses

Genomes and Chromosomes

Transcription, Translation, and Bioinformatics

Gene Transfer, Mutations, and Genome Evolution

Molecular Regulation

Viral Molecular Biology

Biotechniques and Synthetic Biology

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Electron Flow in Organotrophy, Lithotrophy, and Phototrophy

Biosynthesis

Food and Industrial Microbiology

Origins and Evolution

Bacterial Diversity

Eukaryotic Diversity

Microbial Ecology

Microbes in Global Elemental Cycles

Human Microbiota and Innate Immunity

The Adaptive Immune Response

Microbial Pathogenesis

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