Question 1

Which of the following is not considered a macronutrient?

Accepted Answer

A)  Carbon (
C)  
B)  Calcium (Ca) 
C)  Potassium (K) 
D)  Cobalt (Co) E) C) and D)
F) A) and D)

Question 2

The movement of molecules across a membrane from an area of lower concentration to an area of higher concentration with the expenditure of energy is called

Accepted Answer

A)  facilitated diffusion.
B)  osmosis.
C)  passive diffusion.
D)  active transport.E) All of the above
F) A) and B)

Question 3

All of the following are reasons why some scientists believe that the term "prokaryote" is a somewhat artificial designation and should be discarded except

Accepted Answer

A)  Some bacteria have internal membranous structures.
B)  Some bacteria have their genetic material enclosed within a membrane.
C)  Some bacteria have 80S ribosomes.
D)  Many bacterial have cytoskeletal elements.E) A) and D)
F) A) and B)

Question 4

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.E) None of the above
F) A) and D)

Question 5

Sulfur can be obtained from inorganic sources only.

Accepted Answer

A) True 
 B)False

Question 6

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 choices are true.E) None of the above
F) A) and C)

Question 7

A strain of Neisseria gonorrhoeae has undergone a mutation and is no longer able to make pili.Predict the most likely outcome.

Accepted Answer

A)  The bacterial strain will no longer be able to transport certain sugars into the cell.
B)  The bacteria will become more virulent and will more readily establish infection.
C)  The bacteria will become more resistant to antibiotics.
D)  The bacteria will become less virulent and will not be able to readily establish infection.E) C) and D)
F) B) and C)

Question 8

Different transport systems for the same nutrient that are part of the same organism are usually regulated in different ways.

Accepted Answer

A) True 
 B)False

Question 9

Endospores are resistant to most environmental stressors because they have _____ complexed with calcium ions which stabilize DNA.

Accepted Answer

The answer of Endospores are resistant to most environmental stressors...

Question 10

The bacterium
E.coli swims in a straight line,called a __________,for a few seconds; then it stops,tumbles,then swims away in a new direction.

Accepted Answer

The answer of The bacterium
E.coli swims in a straight line,called...

Question 11

The cell membrane is a rigid structure that provides bacteria with their characteristic shapes.

Accepted Answer

A) True 
 B)False

Question 12

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 13

You discover a new transport system used by a newly discovered bacterial species.The sugars that are transported using this system are phosphorylated as they enter the bacterial cell.You would describe this transport system as a(n) _____.

Accepted Answer

A)  facillitated diffusion
B)  micronutrient regulator
C)  passive diffusion
D)  group translocationE) A) and D)
F) B) and D)

Question 14

Which of the following contribute to the environmental resistance of bacterial endospores?

Accepted Answer

A)  Spore coat
B)  Low water content of endospore
C)  Presence of calcium dipicolinate
D)  Lower pH
E)  All of the choices are correct.F) A) and B)
G) D) and E)

Question 15

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 16

The extreme insolubility of ferric iron leaves little free iron available for transport into bacterial cells.

Accepted Answer

A) True 
 B)False

Question 17

The movement of molecules from an area of higher concentration to an area of lower concentration without the participation of specific carrier molecules is called

Accepted Answer

A)  facilitated diffusion.
B)  osmosis.
C)  passive diffusion.
D)  active transport.E) C) and D)
F) A) and B)

Question 18

Which of the following is/are true of capsules?

Accepted Answer

A)  They help bacteria escape phagocytosis by host cells.
B)  They retain water and help prevent desiccation of the bacteria.
C)  They prevent entry of many bacterial viruses.
D)   All of the choices are correct.E) A) and B)
F) A) and C)

Question 19

The trace amounts of micronutrients needed by microorganisms are usually supplied as inadvertent contaminants in water and regular media components.

Accepted Answer

A) True 
 B)False

Question 20

Although penicillin inhibits peptidoglycan synthesis,bacterial cells will continue to grow normally in the presence of penicillin in a(n) __________ environment.

Accepted Answer

A)  hypotonic
B)  isotonic
C)  hypertonic
D)  nonpolarE) B) and C)
F) A) and D)

Exam 3: Bacterial Cell Structure

Although penicillin inhibits peptidoglycan synthesis,bacterial cells will continue to grow normally in the presence of penicillin in a(n) __________ environment.

Correct AnswerverifiedShow Answer

Which of the following contribute to the environmental resistance of bacterial endospores?

Correct AnswerverifiedShow Answer

Different transport systems for the same nutrient that are part of the same organism are usually regulated in different ways.

Correct AnswerverifiedShow Answer

The movement of molecules across a membrane from an area of lower concentration to an area of higher concentration with the expenditure of energy is called

Correct AnswerverifiedShow Answer

A strain of Neisseria gonorrhoeae has undergone a mutation and is no longer able to make pili.Predict the most likely outcome.

Correct AnswerverifiedShow Answer

The movement of molecules from an area of higher concentration to an area of lower concentration without the participation of specific carrier molecules is called

Correct AnswerverifiedShow Answer

Endospores are resistant to most environmental stressors because they have _____ complexed with calcium ions which stabilize DNA.

Correct AnswerverifiedShow Answer

The trace amounts of micronutrients needed by microorganisms are usually supplied as inadvertent contaminants in water and regular media components.

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

The cell membrane is a rigid structure that provides bacteria with their characteristic shapes.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Which of the following is not considered a macronutrient?

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

All of the following are reasons why some scientists believe that the term "prokaryote" is a somewhat artificial designation and should be discarded except

Correct AnswerverifiedShow Answer

Sulfur can be obtained from inorganic sources only.

Correct AnswerverifiedShow Answer

The extreme insolubility of ferric iron leaves little free iron available for transport into bacterial cells.

Correct AnswerverifiedShow Answer

Which of the following is/are true of capsules?

Correct AnswerverifiedShow Answer

Twitching or gliding motility involves

Correct AnswerverifiedShow Answer

The bacterium E.coli swims in a straight line,called a __________,for a few seconds; then it stops,tumbles,then swims away in a new direction.

Correct AnswerverifiedShow Answer

You discover a new transport system used by a newly discovered bacterial species.The sugars that are transported using this system are phosphorylated as they enter the bacterial cell.You would describe this transport system as a(n) _____.

Correct AnswerverifiedShow Answer

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