MICROBIOLOGY CHAPTER 6 TEST BANK.
QUESTIONS AND VERIFIED ANSWERS
2024/2025
Micrococci are facultative halophiles. In Figure 6.1, which line best
depicts the growth of M.
luteus in a nutrient medium containing 7.5% NaCl?
#(__%_)
_)_^()(*
&#%^%
A) a $^$%#$
@#!@
B) b @!$%%
^#&^*$
C) c - ANSWER: B *((%)()
%()()*^(
)*(*(^(*
(^*((*(*
The addition of which of the following to a culture medium will ^(*()()^
*()*(*(
neutralize acids? &*^&*
&*(^
A) Buffers
B) Sugars
C) pH
D) Heat
E) Carbon - ANSWER: Buffers
Salts and sugars work to preserve foods by creating a
A) Depletion of nutrients.
B) Hypotonic environment.
C) Lower osmotic pressure.
D) Hypertonic environment.
, MICROBIOLOGY CHAPTER 6 TEST BANK.
QUESTIONS AND VERIFIED ANSWERS
2024/2025
E) Lower pH. - ANSWER: Hypertonic environment
The term facultative anaerobe refers to an organism that #(__%_)
_)_^()(*
A) Doesnʹt use oxygen but tolerates it. &#%^%
$^$%#$
B) Is killed by oxygen. @#!@
@!$%%
C) Uses oxygen or grows without oxygen. ^#&^*$
*((%)()
D) Requires less oxygen than is present in air. %()()*^(
)*(*(^(*
E) Prefers to grow without oxygen. - ANSWER: Uses oxygen or grows (^*((*(*
without oxygen ^(*()()^
*()*(*(
&*^&*
&*(^
Which of the following is not a disadvantage of the standard plate
count?
A) Cells may form aggregates.
B) Requires incubation time.
C) Determines viable cells.
D) Chemical and physical requirements are determined by media and
incubation.
E) None of the above. - ANSWER: Determines viable cells
Which of the following is not a disadvantage of the direct microscopic
count?
, MICROBIOLOGY CHAPTER 6 TEST BANK.
QUESTIONS AND VERIFIED ANSWERS
2024/2025
A) Some organisms are motile.
B) Enumerates dead cells.
C) No incubation time. #(__%_)
_)_^()(*
D) Sample volume is unknown. &#%^%
$^$%#$
E) Large number of cells is required. - ANSWER: Sample volume is @#!@
unknown @!$%%
^#&^*$
*((%)()
%()()*^(
Which of the following is not used to determine metabolic activity? )*(*(^(*
(^*((*(*
A) Acid production from fermentation. ^(*()()^
*()*(*(
B) CO 2 produced from the Krebs cycle. &*^&*
&*(^
C) NO2- produced from the electron transport chain.
D) Decreased dissolved oxygen.
E) Turbidity. - ANSWER: Turbidity
Thirty-six colonies grew in nutrient agar from 1.0 ml of undiluted
sample in a standard plate
count. How many cells were in the original sample?
A) 4
B) 9
C) 18
D) 36
, MICROBIOLOGY CHAPTER 6 TEST BANK.
QUESTIONS AND VERIFIED ANSWERS
2024/2025
E) 72 - ANSWER: 72
Most bacteria grow best at pH #(__%_)
_)_^()(*
A) 1. &#%^%
$^$%#$
B) 5. @#!@
@!$%%
C) 7. ^#&^*$
*((%)()
D) 9. %()()*^(
)*(*(^(*
E) 14. - ANSWER: 7 (^*((*(*
^(*()()^
*()*(*(
&*^&*
Figure 6.3 shows three containers of water connected by tubes. A &*(^
selectively permeable
membrane divides each tube. Solutes are added to each container to
give final concentrations
of 5% NaCl in a; 10% NaCl in b; and 5% sucrose in c. When the
experiment is first set up, the
initial movement of water will be
A) a to b; b to c; c to a.
B) a to b; c to b; c to a.
C) a to c; b to c; c to a.
D) a to c; c to b; c to a.
E) b to a; b to c; c to a. - ANSWER: a to b; c to b; c to a
QUESTIONS AND VERIFIED ANSWERS
2024/2025
Micrococci are facultative halophiles. In Figure 6.1, which line best
depicts the growth of M.
luteus in a nutrient medium containing 7.5% NaCl?
#(__%_)
_)_^()(*
&#%^%
A) a $^$%#$
@#!@
B) b @!$%%
^#&^*$
C) c - ANSWER: B *((%)()
%()()*^(
)*(*(^(*
(^*((*(*
The addition of which of the following to a culture medium will ^(*()()^
*()*(*(
neutralize acids? &*^&*
&*(^
A) Buffers
B) Sugars
C) pH
D) Heat
E) Carbon - ANSWER: Buffers
Salts and sugars work to preserve foods by creating a
A) Depletion of nutrients.
B) Hypotonic environment.
C) Lower osmotic pressure.
D) Hypertonic environment.
, MICROBIOLOGY CHAPTER 6 TEST BANK.
QUESTIONS AND VERIFIED ANSWERS
2024/2025
E) Lower pH. - ANSWER: Hypertonic environment
The term facultative anaerobe refers to an organism that #(__%_)
_)_^()(*
A) Doesnʹt use oxygen but tolerates it. &#%^%
$^$%#$
B) Is killed by oxygen. @#!@
@!$%%
C) Uses oxygen or grows without oxygen. ^#&^*$
*((%)()
D) Requires less oxygen than is present in air. %()()*^(
)*(*(^(*
E) Prefers to grow without oxygen. - ANSWER: Uses oxygen or grows (^*((*(*
without oxygen ^(*()()^
*()*(*(
&*^&*
&*(^
Which of the following is not a disadvantage of the standard plate
count?
A) Cells may form aggregates.
B) Requires incubation time.
C) Determines viable cells.
D) Chemical and physical requirements are determined by media and
incubation.
E) None of the above. - ANSWER: Determines viable cells
Which of the following is not a disadvantage of the direct microscopic
count?
, MICROBIOLOGY CHAPTER 6 TEST BANK.
QUESTIONS AND VERIFIED ANSWERS
2024/2025
A) Some organisms are motile.
B) Enumerates dead cells.
C) No incubation time. #(__%_)
_)_^()(*
D) Sample volume is unknown. &#%^%
$^$%#$
E) Large number of cells is required. - ANSWER: Sample volume is @#!@
unknown @!$%%
^#&^*$
*((%)()
%()()*^(
Which of the following is not used to determine metabolic activity? )*(*(^(*
(^*((*(*
A) Acid production from fermentation. ^(*()()^
*()*(*(
B) CO 2 produced from the Krebs cycle. &*^&*
&*(^
C) NO2- produced from the electron transport chain.
D) Decreased dissolved oxygen.
E) Turbidity. - ANSWER: Turbidity
Thirty-six colonies grew in nutrient agar from 1.0 ml of undiluted
sample in a standard plate
count. How many cells were in the original sample?
A) 4
B) 9
C) 18
D) 36
, MICROBIOLOGY CHAPTER 6 TEST BANK.
QUESTIONS AND VERIFIED ANSWERS
2024/2025
E) 72 - ANSWER: 72
Most bacteria grow best at pH #(__%_)
_)_^()(*
A) 1. &#%^%
$^$%#$
B) 5. @#!@
@!$%%
C) 7. ^#&^*$
*((%)()
D) 9. %()()*^(
)*(*(^(*
E) 14. - ANSWER: 7 (^*((*(*
^(*()()^
*()*(*(
&*^&*
Figure 6.3 shows three containers of water connected by tubes. A &*(^
selectively permeable
membrane divides each tube. Solutes are added to each container to
give final concentrations
of 5% NaCl in a; 10% NaCl in b; and 5% sucrose in c. When the
experiment is first set up, the
initial movement of water will be
A) a to b; b to c; c to a.
B) a to b; c to b; c to a.
C) a to c; b to c; c to a.
D) a to c; c to b; c to a.
E) b to a; b to c; c to a. - ANSWER: a to b; c to b; c to a
