Question 1

The term used to describe bacteria that have a spherical shape is

Accepted Answer

A)   coccus.
B)   bacillus.
C)   vibrio.
D)   coccobacillus.

Question 2

Export of flagellin subunits is mediated by

Accepted Answer

A)   an apparatus in the basal body of the flagellum that is related to the type II secretion pathway.
B)   the type I secretion pathway.
C)   an apparatus in the basal body of the flagellum that is related to the type III secretion pathway.
D)   none of the above.

Question 3

The layers of peptidoglycan of the bacterial cell wall can be cross-linked by peptide intrabridges or by direct cross-linking.

Accepted Answer

A) True 
 B)False

Question 4

The most widely accepted current model for membrane structures is called the __________ model.

Accepted Answer

The answer of The most widely accepted current model for...

Question 5

In many spirochetes, multiple flagella combine to form a bundle known as a(n) ____________ fibril, which winds around the cell and confers motility on the cell.

Accepted Answer

The answer of In many spirochetes, multiple flagella combine to...

Question 6

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 __________.

Accepted Answer

hydrophili...

Question 7

A(n) __________ layer is a layer of protein or glycoprotein that exhibits a pattern resembling floor tiles.

Accepted Answer

The answer of A(n) __________ layer is a layer of...

Question 8

Proteins that are embedded within the cytoplasmic membrane and not easily extracted are called __________ proteins.

Accepted Answer

A)   peripheral
B)   integral
C)   external
D)   internal

Question 9

Flexible bacteria with a helical shape are called

Accepted Answer

A)   vibrios.
B)   spirilla.
C)   spirochetes.
D)   coccobacilli.

Question 10

The concept of a prokaryote was first fully outlined in 1962 by

Accepted Answer

A)   Watson and Crick
B)   Stanier and Van Niel
C)   Hersey and Chase
D)   Gilbert and Cech

Question 11

Enzymes that are secreted out of the cell to aid in the acquisition and digestion of environmental nutrients are called __________.

Accepted Answer

The answer of Enzymes that are secreted out of the...

Question 12

Gram-positive bacteria have a structurally and chemically more complex cell wall than gram-negative bacteria.

Accepted Answer

A) True 
 B)False

Question 13

Rigid bacteria with a helical cell shape are called

Accepted Answer

A)   vibrios.
B)   spirilla.
C)   spirochetes.
D)   coccobacilli.

Question 14

Twitching or gliding motility involves

Accepted Answer

A)   type IV pili.
B)   axial fibrils.
C)   movement of slime.
D)   both type IV pili and movement of slime can be involved in twitching or gliding motility.

Question 15

_______ is a peptidoglycan-like molecule found in the cell walls of some archaea.

Accepted Answer

The answer of _______ is a peptidoglycan-like molecule found in...

Question 16

Proteins that are loosely associated with the cytoplasmic membrane are called __________ proteins.

Accepted Answer

A)   peripheral
B)   integral
C)   external
D)   internal

Question 17

Gram-positive bacteria have a thinner layer of peptidoglycan than gram-negative bacteria.

Accepted Answer

A) True 
 B)False

Question 18

A __________ layer consists of diffuse unorganized polysaccharide material that lies outside the cell wall and is easily removed.

Accepted Answer

The answer of A __________ layer consists of diffuse unorganized...

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

All of the following statements about the periplasmic space are true except:

Accepted Answer

A)   It is found only in gram-positive bacteria.
B)   It is located between the plasma membrane and outer membrane of gram-negative bacteria.
C)   It contains hydrolytic enzymes and binding proteins involved in nutrient acquisition.
D)   All of the above are true.

Exam 3: Bacteria and Archaea

In many spirochetes, multiple flagella combine to form a bundle known as a(n) ____________ fibril, which winds around the cell and confers motility on the cell.

Correct AnswerverifiedShow Answer

Flexible bacteria with a helical shape are called

Correct AnswerverifiedShow Answer

The layers of peptidoglycan of the bacterial cell wall can be cross-linked by peptide intrabridges or by direct cross-linking.

Correct AnswerverifiedShow Answer

Gram-positive bacteria have a thinner layer of peptidoglycan than gram-negative bacteria.

Correct AnswerverifiedShow Answer

The most widely accepted current model for membrane structures is called the __________ model.

Correct AnswerverifiedShow Answer

_______ is a peptidoglycan-like molecule found in the cell walls of some archaea.

Correct AnswerverifiedShow Answer

Rigid bacteria with a helical cell shape are called

Correct AnswerverifiedShow Answer

A(n) __________ layer is a layer of protein or glycoprotein that exhibits a pattern resembling floor tiles.

Correct AnswerverifiedShow Answer

Export of flagellin subunits is mediated by

Correct AnswerverifiedShow Answer

Gram-positive bacteria have a structurally and chemically more complex cell wall than gram-negative bacteria.

Correct AnswerverifiedShow Answer

Proteins that are embedded within the cytoplasmic membrane and not easily extracted are called __________ proteins.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

The term used to describe bacteria that have a spherical shape is

Correct AnswerverifiedShow Answer

The concept of a prokaryote was first fully outlined in 1962 by

Correct AnswerverifiedShow Answer

Twitching or gliding motility involves

Correct AnswerverifiedShow Answer

Enzymes that are secreted out of the cell to aid in the acquisition and digestion of environmental nutrients are called __________.

Correct AnswerverifiedShow Answer

A __________ layer consists of diffuse unorganized polysaccharide material that lies outside the cell wall and is easily removed.

Correct AnswerverifiedShow Answer

Proteins that are loosely associated with the cytoplasmic membrane are called __________ proteins.

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 __________.

Correct Answerverifiedhydrophili...View AnswerShow Answer

All of the following statements about the periplasmic space are true except:

Correct AnswerverifiedShow Answer

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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 .

Correct Answer
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hydrophili...
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Correct Answer
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