Question 1

From which area would you be able to isolate the bacterium Halobacterium?

Accepted Answer

A)   the Pacific ocean
B)   the Indian ocean
C)   Lake Michigan
D)   the Great Salt Lake
E)   the Mediterranean SeaF) B) and C)
G) B) and E) D

Question 2

Why did Woese and Fox use rRNA gene sequences to compare the phylogenetic relatedness between microbes?

Accepted Answer

Carl Woese and George E. Fox used riboso...

Question 3

Some archaeal cells contain pseudopeptidoglycan as their major cell wall component.What is this material composed of?

Accepted Answer

A)   Lipids and proteins.
B)   Sugar polymers cross-linked via a peptide bridge.
C)   Sugar polymers that are linked to lipids via an ether bond.
D)   Proteins liked together via a glycosidic bond.
E)   Lipids cross-linked via a peptide bridge.F) A) and B)
G) None of the above

Question 4

Why might the process of chemotaxis in the archaeon Halobacterium be similar to chemotaxis in Bacteria?

Accepted Answer

A)   Similar proteins in the chemotaxis signaling pathway are found in both Halobacterium and Bacteria.
B)   The flagellin protein is almost identical in sequence for both Halobacterium and Bacteria.
C)   Genes that encode proteins for flagellum assembly are found in both Halobacterium and Bacteria.
D)   Both Halobacterium and Bacteria use ATP to turn the flagellum.
E)   Flagellum assemble is identical in both Halobacterium and Bacteria.F) A) and C)
G) B) and E)

Question 5

All members of the Archaea live in extreme environments.

Accepted Answer

A) True 
 B)False

Question 6

What is the specific action of bacteriorhodopsin?

Accepted Answer

A)   Modification of vitamins for use in metabolism.
B)   Assembles ADP and phosphate to make ATP.
C)   Binds glucose and other sugars in the cell.
D)   Facilitates the movement of glucose across the cell membrane.
E)   Produces proton motive force using light energy.F) A) and D)
G) A) and C)

Question 7

In which of these are Archaea and Bacteria significantly different?

Accepted Answer

A)   cell size
B)   chromosome size and organization
C)   lack of a membrane-enclosed nucleus
D)   membrane lipid structure
E)   possessesion of membrane enclosed organellesF) A) and D)
G) C) and D)

Question 8

The secondary structure and amino acid composition of proteins from hyperthermophiles differ somewhat from proteins in mesophiles.What would you expect to find in thermophiles?

Accepted Answer

A)   More β-sheets and the amino acids tyrosine and arginine.
B)   More α-helices and the amino acids tyrosine and arginine.
C)   More β-sheets and the amino acids cysteine and serine.
D)   More β-sheets and the amino acids glycine and glutamate.
E)   More α-helices and the amino acids cysteine and serine.F) A) and B)
G) None of the above

Question 9

Many cultured and characterized strains from the phylum Crenarchaeota were isolated from _____ .

Accepted Answer

A)   the ocean
B)   freshwater lakes
C)   thermal hot springs
D)   dry soil
E)   sea iceF) A) and E)
G) A) and D)

Question 10

How does the Archaea cytoplasmic membrane differ- from the Bacteria membrane?

Accepted Answer

A)   The Archaeal membrane contains cholesterol.
B)   The Archaeal membrane contains no proteins.
C)   The Archaeal membrane is comprised of fatty acids attached to glycerol phosphate by an ester linkage.
D)   The Archaeal membrane is comprised of isoprenoids attached to glycerol phosphate by an ether linkage.
E)   The Archaeal membrane gives the cell its characteristic shape.F) A) and E)
G) B) and E)

Question 11

What are chaperonins ("molecular chaperones") ?

Accepted Answer

A)   Channels in the membrane for protein secretion.
B)   Proteins used for the secretion of other proteins.
C)   Proteins used for the correct folding of other proteins.
D)   Proteins involved in the regulation of gene expression at the level of transcription.
E)   Sensory proteins found in the cytoplasmic membrane to sense various environmental signals.F) C) and D)
G) All of the above

Question 12

Evidence clearly shows that Archaea are direct descendants of the earliest life forms.

Accepted Answer

A) True 
 B)False

Question 13

Which member of the Archaea domain is a parasite of the archaeon Ignicoccus hospitalis and has one of the smallest genomes of all living microbes?

Accepted Answer

A)   Pyrolobus fumarii
B)   Thermoplasma acidophilum
C)   Nanoarchaeum equitans
D)   Nitrosopumilus maritimus
E)   Sulfolobus solfataricusF) C) and D)
G) A) and B)

Question 14

How do the Bacteria and Archaea differ in the way the flagellum proteins are handled?

Accepted Answer

A)   Archaea proteins are assembled inside the cell for transport out of the cell.
B)   Archaea proteins are excreted to the outside of the cell for self-assembly.
C)   Archaea proteins are added to the growing flagellum shaft at the base.
D)   Archaea proteins are transported through the hollow flagellum tube for assembly at the end of the flagellum.
E)   Archaea proteins are enclosed within a membrane and moved to the outside of the cell.F) A) and E)
G) C) and D)

Question 15

Members of the archaeal phylum Euryarchaeota are similar in their rRNA gene sequence but differ greatly in their metabolic characteristics.

Accepted Answer

A) True 
 B)False

Question 16

You would be able to find methanogens in all of the following environments EXCEPT:

Accepted Answer

A)   the rumen of bovines.
B)   the bottom of a swamp.
C)   a well aerated aquifer.
D)   sediments from a freshwater lake.
E)   the benthic region of the ocean.F) A) and B)
G) A) and C) C

Question 17

Besides the methanogens and the halophiles,the phylum Euryarchaeota contains many thermophiles and hyperthermophiles.Most of these are also classified as _____ .

Accepted Answer

A)   halophiles
B)   psychrophiles
C)   barophiles
D)   mesophiles
E)   acidophilesF) A) and D)
G) B) and E)

Question 18

All known methanogens are found in the domain ___.

Accepted Answer

archaea

Question 19

What is the size range of a typical Archaea cell?

Accepted Answer

A)  1 - 5 nm
B)   20 - 50 nm
C)   1 - 5 µm
D)   20 - 50 µm
E)   1 - 5 mmF) B) and D)
G) All of the above

Question 20

Which of these is one of the main functions of the cytoplasmic membrane in Archaea?

Accepted Answer

A)   It protects against effects of differing osmotic pressure
B)   It gives the cell its characteristic shapes
C)   It acts as a semi permeable barrier to the diffusion of molecules into and out of the cell.
D)   It prevents the diffusion of gases into and out of the cell.
E)   It allows attachment to specific receptor molecules on solid surfaces in the environment.F) A) and B)
G) A) and C)

Exam 4: Archaea

From which area would you be able to isolate the bacterium Halobacterium?

Correct AnswerverifiedD

Why did Woese and Fox use rRNA gene sequences to compare the phylogenetic relatedness between microbes?

Correct AnswerAnswered by ExamLex AICarl Woese and George E. Fox used riboso...View AnswerShow Answer

Some archaeal cells contain pseudopeptidoglycan as their major cell wall component.What is this material composed of?

Correct AnswerverifiedShow Answer

Why might the process of chemotaxis in the archaeon Halobacterium be similar to chemotaxis in Bacteria?

Correct AnswerverifiedShow Answer

All members of the Archaea live in extreme environments.

Correct AnswerverifiedShow Answer

What is the specific action of bacteriorhodopsin?

Correct AnswerverifiedShow Answer

In which of these are Archaea and Bacteria significantly different?

Correct AnswerverifiedShow Answer

The secondary structure and amino acid composition of proteins from hyperthermophiles differ somewhat from proteins in mesophiles.What would you expect to find in thermophiles?

Correct AnswerverifiedShow Answer

Many cultured and characterized strains from the phylum Crenarchaeota were isolated from _____ .

Correct AnswerverifiedShow Answer

How does the Archaea cytoplasmic membrane differ- from the Bacteria membrane?

Correct AnswerverifiedShow Answer

What are chaperonins ("molecular chaperones") ?

Correct AnswerverifiedShow Answer

Evidence clearly shows that Archaea are direct descendants of the earliest life forms.

Correct AnswerverifiedShow Answer

Which member of the Archaea domain is a parasite of the archaeon Ignicoccus hospitalis and has one of the smallest genomes of all living microbes?

Correct AnswerverifiedShow Answer

How do the Bacteria and Archaea differ in the way the flagellum proteins are handled?

Correct AnswerverifiedShow Answer

Members of the archaeal phylum Euryarchaeota are similar in their rRNA gene sequence but differ greatly in their metabolic characteristics.

Correct AnswerverifiedShow Answer

You would be able to find methanogens in all of the following environments EXCEPT:

Correct AnswerverifiedC

Besides the methanogens and the halophiles,the phylum Euryarchaeota contains many thermophiles and hyperthermophiles.Most of these are also classified as _____ .

Correct AnswerverifiedShow Answer

All known methanogens are found in the domain ___.

Correct Answerverifiedarchaea

What is the size range of a typical Archaea cell?

Correct AnswerverifiedShow Answer

Which of these is one of the main functions of the cytoplasmic membrane in Archaea?

Correct AnswerverifiedShow Answer

Correct Answer
verified
D

Correct Answer
Answered by ExamLex AI
Carl Woese and George E. Fox used riboso...
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

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
C

Correct Answer
verified

Correct Answer
verified
archaea

Correct Answer
verified

Correct Answer
verified