Question 1

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

Accepted Answer

A) True 
 B)False

Question 2

Archaeal flagella are superficially similar to bacterial flagella,although archaeal flagella are much thicker than bacterial flagella.

Accepted Answer

A) True 
 B)False

Question 3

The DNA of some archaeons is stabilized by association with archaeal histone proteins forming particles resembling eucaryotic nucleosomes.

Accepted Answer

A) True 
 B)False

Question 4

Archaeons are not known to incorporate (fix)carbon dioxide.

Accepted Answer

A) True 
 B)False

Question 5

The cell membranes of wall-less archaeons are strengthened by

Accepted Answer

A)  diglycerol ethers.
B)  glycoprotein or protein layers.
C)  pseudomurein.
D)  diglycerol tetraethers.

Question 6

A feature unique to some archaeal plasma membranes is that they may

Accepted Answer

A)  consist of a lipid bilayer that lacks integral membrane proteins.
B)  consist of a lipid bilayer with embedded proteins.
C)  contain sterols such as cholesterol.
D)  consist of a lipid monolayer.

Question 7

Archaeal cell walls

Accepted Answer

A)  are disrupted by treatment with lysozyme or penicillin.
B)  are similar to those of gram-negative bacteria.
C)  lack murein and D-amino acids.
D)  include orthomureine.

Question 8

_______ are the site of protein synthesis in the cell.

Accepted Answer

Ribosomes

Question 9

Unlike members of the Bacteria,most archaeons have linear chromosomes with multiple origins of replication.

Accepted Answer

A) True 
 B)False

Question 10

Some methanogenic Archaea are capable of fixing nitrogen.

Accepted Answer

A) True 
 B)False

Question 11

Archaeons have been isolated from temperate and cold environments.

Accepted Answer

A) True 
 B)False

Question 12

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. A

Question 13

Because archaeons lack peptidoglycan in their cell walls

Accepted Answer

A)  some have an outer layer of complex polysaccharide.
B)  some have an outer layer of protein.
C)  they must always be grown in isotonic medium.
D)  some have an outer layer of complex polysaccharide and some have an outer layer of protein D

Question 14

Methanogens may contribute to the greenhouse effect and global warming due to methane production.

Accepted Answer

A) True 
 B)False

Question 15

External structures that are found in Archaea but not Bacteria are ___.

Accepted Answer

A)  pili
B)  flagella
C)  hami
D)  peptidoglycan

Question 16

Molecules or regions of molecules that readily interact with water are said to be __________,whereas molecules or regions of molecules that are insoluble in water or do not readily interact with water are said to be hydrophobic.

Accepted Answer

The answer of Molecules or regions of molecules that readily...

Question 17

The hydrocarbons found in the membranes of archaea are identical to those found in bacteria.

Accepted Answer

A) True 
 B)False

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.

Question 19

Archaeal membranes contain which of the following lipids?

Accepted Answer

A)  phospholipids
B)  sulfolipids
C)  glycolipids
D)  all of these

Question 20

Some archaeal cells lack a cell wall.

Accepted Answer

A) True 
 B)False

Exam 4: Archaeal Cell Structure

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

Correct AnswerverifiedShow Answer

Archaeal flagella are superficially similar to bacterial flagella,although archaeal flagella are much thicker than bacterial flagella.

Correct AnswerverifiedShow Answer

The DNA of some archaeons is stabilized by association with archaeal histone proteins forming particles resembling eucaryotic nucleosomes.

Correct AnswerverifiedShow Answer

Archaeons are not known to incorporate (fix)carbon dioxide.

Correct AnswerverifiedShow Answer

The cell membranes of wall-less archaeons are strengthened by

Correct AnswerverifiedShow Answer

A feature unique to some archaeal plasma membranes is that they may

Correct AnswerverifiedShow Answer

Archaeal cell walls

Correct AnswerverifiedShow Answer

_______ are the site of protein synthesis in the cell.

Correct AnswerverifiedRibosomes

Unlike members of the Bacteria,most archaeons have linear chromosomes with multiple origins of replication.

Correct AnswerverifiedShow Answer

Some methanogenic Archaea are capable of fixing nitrogen.

Correct AnswerverifiedShow Answer

Archaeons have been isolated from temperate and cold environments.

Correct AnswerverifiedShow Answer

Diglycerol tetraether lipids

Correct AnswerverifiedA

Because archaeons lack peptidoglycan in their cell walls

Correct AnswerverifiedD

Methanogens may contribute to the greenhouse effect and global warming due to methane production.

Correct AnswerverifiedShow Answer

External structures that are found in Archaea but not Bacteria are ___.

Correct AnswerverifiedShow Answer

Molecules or regions of molecules that readily interact with water are said to be __________,whereas molecules or regions of molecules that are insoluble in water or do not readily interact with water are said to be hydrophobic.

Correct AnswerverifiedShow Answer

The hydrocarbons found in the membranes of archaea are identical to those found in bacteria.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Archaeal membranes contain which of the following lipids?

Correct AnswerverifiedShow Answer

Some archaeal cells lack a cell wall.

Correct AnswerverifiedShow Answer

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Ribosomes

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A

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D

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