Question 1

_______ are the site of protein synthesis in the cell.

Accepted Answer

Ribosomes

Question 2

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 3

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 4

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

Accepted Answer

A) True 
 B)False

Question 5

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

Accepted Answer

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

Question 6

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

Accepted Answer

A) True 
 B)False

Question 7

Archaeal membranes contain which of the following lipids?

Accepted Answer

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

Question 8

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 9

Some methanogenic Archaea are capable of fixing nitrogen.

Accepted Answer

A) True 
 B)False

Question 10

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 11

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 12

Archaeons have been isolated from temperate and cold environments.

Accepted Answer

A) True 
 B)False

Question 13

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 14

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

Accepted Answer

A) True 
 B)False

Question 15

Some archaeal cells lack a cell wall.

Accepted Answer

A) True 
 B)False

Question 16

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 17

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

Accepted Answer

A) True 
 B)False

Question 18

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

Accepted Answer

A) True 
 B)False

Question 19

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

Accepted Answer

A) True 
 B)False

Question 20

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

Accepted Answer

A) True 
 B)False

Exam 4: Archaeal Cell Structure

_______ are the site of protein synthesis in the cell.

Diglycerol tetraether lipids

Because archaeons lack peptidoglycan in their cell walls

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

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

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

Archaeal membranes contain which of the following lipids?

Archaeal cell walls

Some methanogenic Archaea are capable of fixing nitrogen.

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.

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

Archaeons have been isolated from temperate and cold environments.

The cell membranes of wall-less archaeons are strengthened by

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

Some archaeal cells lack a cell wall.

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

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

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

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

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