Question 1

Pseudopeptidoglycan (pseudomurein) is part of the cell wall of some methanogens.

Accepted Answer

A) True 
 B)False

Question 2

Some of the largest naturally occurring plasmids occur in the

Accepted Answer

A)  extreme halophiles. 
B)  genus Picrophilus. 
C)  genus Thermoplasma. 
D)  methanogens. 
A)  extreme halophiles. 
B)  genus Picrophilus. 
C)  genus Thermoplasma. 
D)  methanogens.

Question 3

Thus far, only Archaea have been found in the salt lakes, while Bacteria and Eukarya are noticeably absent.

Accepted Answer

A) True 
 B)False

Question 4

It is difficult to estimate when cyanobacteria appeared on Earth, because_______.

Accepted Answer

several anaerobic ro

Question 5

What is thought to be the maximum temperature for life to exist?

Accepted Answer

A)  125°C 
B)  500°C 
C)  150°C 
D)  250°C 
A)  125°C 
B)  500°C 
C)  150°C 
D)  250°C

Question 6

Some crenarchaeotes have growth optima above the boiling point of water (at atmospheric pressure).

Accepted Answer

A) True 
 B)False

Question 7

In chemolithotrophic Archaea, H2 is a common electron donor.

Accepted Answer

A) True 
 B)False

Question 8

In general, the halophiles are well adapted, both internally and externally, to life in a highly ionic environment.

Accepted Answer

A) True 
 B)False

Question 9

The cytoplasmic proteins of Halobacterium are

Accepted Answer

A)  highly basic. 
B)  variable, depending on the species. 
C)  generally neutral. 
D)  highly acidic. 
A)  highly basic. 
B)  variable, depending on the species. 
C)  generally neutral. 
D)  highly acidic.

Question 10

Hyperthermophilic Archaea, which oxidize _______, often couple it to the reduction of an anion such as nitrate or a cation such as ferric iron.

Accepted Answer

The answer of Hyperthermophilic Archaea, which oxidize _______, often couple...

Question 11

In general, the cold- dwelling crenarchaeotes are evolving more slowly than the hyperthermophilic crenarchaeotes.

Accepted Answer

A) True 
 B)False

Question 12

The rRNA gene sequences of hyperthermophilic Archaea and Bacteria over time have diverged relatively_________ , and this is likely due to unusually _________ regarding sequence changes.

Accepted Answer

little / s

Question 13

_________is a light- driven protein present in Halobacteria that pumps Cl- into the cell as an anion for K+.

Accepted Answer

The answer of _________is a light- driven protein present in...

Question 14

The taxonomy of the methanogens is based on

Accepted Answer

A)  phylogenetic (comparative nucleic acid sequencing) analysis. 
B)  neither phenotypic nor phylogenetic analysis. 
C)  phenotypic analysis. 
D)  phenotypic and phylogenetic analyses. 
A)  phylogenetic (comparative nucleic acid sequencing) analysis. 
B)  neither phenotypic nor phylogenetic analysis. 
C)  phenotypic analysis. 
D)  phenotypic and phylogenetic analyses.

Question 15

Which of the following is TRUE about Sulfolobus?

Accepted Answer

A)  Sulfolobus is an anaerobic chemolithotroph. 
B)  Sulfolobus can grow chemoorganotrophically. 
C)  Sulfolobus is a gram- positive rod. 
D)  Sulfolobus grows in sulfur- rich hot alkaline springs. 
A)  Sulfolobus is an anaerobic chemolithotroph. 
B)  Sulfolobus can grow chemoorganotrophically. 
C)  Sulfolobus is a gram- positive rod. 
D)  Sulfolobus grows in sulfur- rich hot alkaline springs.

Question 16

Why does Archaeoglobus represent a metabolically transitional type of organism that bridged the energy- generating processes of H2S production and methanogenesis?

Accepted Answer

Archaeoglobus is not generally thought o

Question 17

What do most halobacteria use for carbon substrates?

Accepted Answer

A)  carbohydrates 
B)  lipids 
C)  nucleic acids 
D)  amino and organic acids 
A)  carbohydrates 
B)  lipids 
C)  nucleic acids 
D)  amino and organic acids

Question 18

Although lacking in known diversity, acetotrophic methanogens are ecologically significant in nature.

Accepted Answer

A) True 
 B)False

Question 19

The amino acid composition of thermostable proteins is not particularly unusual, except for a bias for increased levels of amino acids that form a- helices.

Accepted Answer

A) True 
 B)False

Question 20

Much like in Bacteria, the bioenergetics of anaerobic respiring Archaea such as those of the Crenarchaeota involve_______ from which_______ energy is synthesized via_______ .

Accepted Answer

proton tra

Exam 19: Archaea

Pseudopeptidoglycan (pseudomurein) is part of the cell wall of some methanogens.

Some of the largest naturally occurring plasmids occur in the

Thus far, only Archaea have been found in the salt lakes, while Bacteria and Eukarya are noticeably absent.

It is difficult to estimate when cyanobacteria appeared on Earth, because_______.

What is thought to be the maximum temperature for life to exist?

Some crenarchaeotes have growth optima above the boiling point of water (at atmospheric pressure).

In chemolithotrophic Archaea, H2 is a common electron donor.

In general, the halophiles are well adapted, both internally and externally, to life in a highly ionic environment.

The cytoplasmic proteins of Halobacterium are

Hyperthermophilic Archaea, which oxidize _______, often couple it to the reduction of an anion such as nitrate or a cation such as ferric iron.

In general, the cold- dwelling crenarchaeotes are evolving more slowly than the hyperthermophilic crenarchaeotes.

The rRNA gene sequences of hyperthermophilic Archaea and Bacteria over time have diverged relatively_________ , and this is likely due to unusually _________ regarding sequence changes.

_________is a light- driven protein present in Halobacteria that pumps Cl- into the cell as an anion for K+.

The taxonomy of the methanogens is based on

Which of the following is TRUE about Sulfolobus?

Why does Archaeoglobus represent a metabolically transitional type of organism that bridged the energy- generating processes of H2S production and methanogenesis?

What do most halobacteria use for carbon substrates?

Although lacking in known diversity, acetotrophic methanogens are ecologically significant in nature.

The amino acid composition of thermostable proteins is not particularly unusual, except for a bias for increased levels of amino acids that form a- helices.

Much like in Bacteria, the bioenergetics of anaerobic respiring Archaea such as those of the Crenarchaeota involve_______ from which_______ energy is synthesized via_______ .

Microorganisms and Microbiology

A Brief Journey to the Microbial World

Cell Structure and Function in Bacteria and Archaea

Nutrition, Culture, and Metabolism of Microorganisms

Microbial Growth

Molecular Biology of Bacteria

Archael and Eukaryotic Molecular Biology

Regulation of Gene Expression

Viruses and Virology

Genetics of Bacteria and Arachaea

Genetic Engineering

Microbial Genomics

Phototrophy, Chemolithotrophy, and Major Biosyntheses

Catabolism of Organic Compounds

Commercial Products and Biotechnology

Microbial Evolution and Systematics

Bacteria: the Proteobacteria

Other Bacteria

Eukaryotic Cell Biology and Eukaryotic Microorganisms

Viral Diversity

Methods in Microbial Ecology

Major Microbial Habitats and Diversity

Nutrient Cycles, Biodegradation, and Bioremediation

Microbial Symbioses

Microbial Growth Control

Microbial Interactions With Humans

Immunity and Host Defense

Immune Mechanisms

Molecular Immunology

Diagnostic Microbiology and Immunology

Epidemiology

Person-To-Person Microbial Diseases

Vectorborne and Soilborne Microbial Pathogens

Wastewater Treatment, Water Purification, and Waterborne Microbial Diseases

Food Preservation and Foodborne Microbial Diseases

Filters

In chemolithotrophic Archaea, H₂ is a common electron donor.

The rRNA gene sequences of hyperthermophilic Archaea and Bacteria over time have diverged relatively_ , and this is likely due to unusually _ regarding sequence changes.

_________is a light- driven protein present in Halobacteria that pumps Cl- into the cell as an anion for K⁺.

Why does Archaeoglobus represent a metabolically transitional type of organism that bridged the energy- generating processes of H₂S production and methanogenesis?

Much like in Bacteria, the bioenergetics of anaerobic respiring Archaea such as those of the Crenarchaeota involve___ from which_ energy is synthesized via_____ .