Question 1

In marine sediments, CO₂ is reduced to CH₄ by

Accepted Answer

A)  bacteria containing proteorhodopsin. 
B)  oxygenic cyanobacteria. 
C)  methanotrophic archaea. 
D)  methanogenic archaea. 
E)  nonpurple sulfur bacteria. 
A)  bacteria containing proteorhodopsin. 
B)  oxygenic cyanobacteria. 
C)  methanotrophic archaea. 
D)  methanogenic archaea. 
E)  nonpurple sulfur bacteria.

Question 2

The molecule shown below, __________, is a cofactor for electron transport.

Accepted Answer

A)  a cytochrome 
B)  ubiquinone 
C)  flavin mononucleotide 
D)  nicotine amide dinucleotide 
E)  heme b 
A)  a cytochrome 
B)  ubiquinone 
C)  flavin mononucleotide 
D)  nicotine amide dinucleotide 
E)  heme b

Question 3

Enzymes transferring electrons at the start of the ETS are referred to as __________, whereas enzymes transferring electrons to the terminal electron acceptor are designated as __________.

Accepted Answer

A)  dehydrogenases; oxidases 
B)  oxidases; dehydrogenases 
C)  sulfatases; nitrogenases 
D)  permeases; proton pumps 
E)  lyases; hydrolases 
A)  dehydrogenases; oxidases 
B)  oxidases; dehydrogenases 
C)  sulfatases; nitrogenases 
D)  permeases; proton pumps 
E)  lyases; hydrolases

Question 4

In oxygenic photosynthesis, __________ is the electron donor, whereas in anaerobic photosynthesis it can be succinate or __________.

Accepted Answer

A)  H₂S; S0 
B)  O₂; H₂ 
C)  O₂; H₂O 
D)  H₂O; H₂S 
E)  H₂S; SO 
A)  H₂S; S0 
B)  O₂; H₂ 
C)  O₂; H₂O 
D)  H₂O; H₂S 
E)  H₂S; SO

Question 5

Which organism can respire with uranium and remediate uranium-contaminated water?

Accepted Answer

A)  R. palustris 
B)  Shewanella sp 
C)  G. metallireducens 
D)  Salmonella sp 
E)  Brucella sp 
A)  R. palustris 
B)  Shewanella sp 
C)  G. metallireducens 
D)  Salmonella sp 
E)  Brucella sp

Question 6

Which of the following is FALSE with respect to the use of sulfate by marine archaeal and bacterial groups?

Accepted Answer

A)  Oxidized sulfur-containing molecules have redox potentials lower than those of the nitrogen series. 
B)  Oxidized sulfur molecules such as sulfate and sulfite serve as electron acceptors. 
C)  Sulfate and sulfite can receive electrons from hydrocarbons. 
D)  Sulfate-reducing archaea and bacteria are widespread in the ocean. 
E)  Sulfate is more abundant than chloride in the ocean. 
A)  Oxidized sulfur-containing molecules have redox potentials lower than those of the nitrogen series. 
B)  Oxidized sulfur molecules such as sulfate and sulfite serve as electron acceptors. 
C)  Sulfate and sulfite can receive electrons from hydrocarbons. 
D)  Sulfate-reducing archaea and bacteria are widespread in the ocean. 
E)  Sulfate is more abundant than chloride in the ocean.

Question 7

What is photoheterotrophy? Give examples of photoheterotrophic organisms.

Accepted Answer

The combination of light absorption to g

Question 8

In photosystem II of purple bacteria, electrons flow through cytochrome bc, coupled to pumping of protons and the proton potential drives synthesis of ATP. The cytochrome bc complex transfers the electrons back to bacteriochlorophyll P870. This type of ATP synthesis is called

Accepted Answer

A)  reverse electron flow. 
B)  membrane potential. 
C)  noncyclic photophosphorylation. 
D)  cyclic photophosphorylation. 
E)  proton motive force. 
A)  reverse electron flow. 
B)  membrane potential. 
C)  noncyclic photophosphorylation. 
D)  cyclic photophosphorylation. 
E)  proton motive force.

Question 9

The following are cellular processes that can be directly powered by the proton motive force (Δp), EXCEPT

Accepted Answer

A)  ATP biosynthesis from ADP and Pi. 
B)  flagellar rotation. 
C)  nutrient uptake. 
D)  drug efflux in some pathogens. 
E)  protein biosynthesis. 
A)  ATP biosynthesis from ADP and Pi. 
B)  flagellar rotation. 
C)  nutrient uptake. 
D)  drug efflux in some pathogens. 
E)  protein biosynthesis.

Question 10

What is lithotrophy?

Accepted Answer

A)  breakdown of molecules using light energy 
B)  oxidation of organic electron donors to CO₂ and H₂O 
C)  photolysis of H₂S or H₂O coupled to CO₂ fixation 
D)  oxidation of inorganic electron donors such as Fe2+ using O₂ or anaerobic electronic acceptors 
E)  physical breakdown of food particles to facilitate ingestion 
A)  breakdown of molecules using light energy 
B)  oxidation of organic electron donors to CO₂ and H₂O 
C)  photolysis of H₂S or H₂O coupled to CO₂ fixation 
D)  oxidation of inorganic electron donors such as Fe2+ using O₂ or anaerobic electronic acceptors 
E)  physical breakdown of food particles to facilitate ingestion

In marine sediments, CO₂ is reduced to CH₄ by

The molecule shown below, __________, is a cofactor for electron transport.

Enzymes transferring electrons at the start of the ETS are referred to as , whereas enzymes transferring electrons to the terminal electron acceptor are designated as .

In oxygenic photosynthesis, is the electron donor, whereas in anaerobic photosynthesis it can be succinate or .

Which organism can respire with uranium and remediate uranium-contaminated water?

Which of the following is FALSE with respect to the use of sulfate by marine archaeal and bacterial groups?

What is photoheterotrophy? Give examples of photoheterotrophic organisms.

In photosystem II of purple bacteria, electrons flow through cytochrome bc, coupled to pumping of protons and the proton potential drives synthesis of ATP. The cytochrome bc complex transfers the electrons back to bacteriochlorophyll P870. This type of ATP synthesis is called

The following are cellular processes that can be directly powered by the proton motive force (Δp), EXCEPT

What is lithotrophy?

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

Energetics and Catabolism

Biosynthesis

Food and Industrial Microbiology

Origins and Evolution

Bacterial Diversity

Archaeal Diversity

Eukaryotic Diversity

Microbial Ecology

Microbes in Global Elemental Cycles

Human Microbiota and Innate Immunity

The Adaptive Immune Response

Microbial Pathogenesis

Microbial Diseases

Antimicrobial Therapy

Clinical Microbiology and Epidemiology

Filters

Exam 14: Electron Flow in Organotrophy, Lithotrophy, and Phototrophy

In marine sediments, CO₂ is reduced to CH₄ by

The molecule shown below, __________, is a cofactor for electron transport.

Enzymes transferring electrons at the start of the ETS are referred to as __________, whereas enzymes transferring electrons to the terminal electron acceptor are designated as __________.

In oxygenic photosynthesis, __________ is the electron donor, whereas in anaerobic photosynthesis it can be succinate or __________.

Which organism can respire with uranium and remediate uranium-contaminated water?

Which of the following is FALSE with respect to the use of sulfate by marine archaeal and bacterial groups?

What is photoheterotrophy? Give examples of photoheterotrophic organisms.

In photosystem II of purple bacteria, electrons flow through cytochrome bc, coupled to pumping of protons and the proton potential drives synthesis of ATP. The cytochrome bc complex transfers the electrons back to bacteriochlorophyll P870. This type of ATP synthesis is called

The following are cellular processes that can be directly powered by the proton motive force (Δp), EXCEPT

What is lithotrophy?

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

Energetics and Catabolism

Biosynthesis

Food and Industrial Microbiology

Origins and Evolution

Bacterial Diversity

Archaeal Diversity

Eukaryotic Diversity

Microbial Ecology

Microbes in Global Elemental Cycles

Human Microbiota and Innate Immunity

The Adaptive Immune Response

Microbial Pathogenesis

Microbial Diseases

Antimicrobial Therapy

Clinical Microbiology and Epidemiology

Filters

Enzymes transferring electrons at the start of the ETS are referred to as , whereas enzymes transferring electrons to the terminal electron acceptor are designated as .

In oxygenic photosynthesis, is the electron donor, whereas in anaerobic photosynthesis it can be succinate or .