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Micro Chapter 6
Test Description: Micro Chapter 6
Instructions: Answer all questions to get your test result.
1) Salts and sugars work to preserve foods by creating a
A
lower pH.
B
depletion of nutrients.
C
hypertonic environment.
D
hypotonic environment.
2) Most bacteria grow best at pH
A
7
B
5
C
14
D
1
3) Which of the following pairs of microbe classification terms and optimal growth temperatures is mismatched?
A
psychrophile – growth at 15°C
B
mesophile – growth at 25-40°C
C
thermophile – growth at 37°C
D
psychrotroph – growth at 20-30°C
4) During which growth phase will gram-positive bacteria be most susceptible to penicillin?
A
stationary phase
B
lag phase
C
log phase
D
The culture is equally susceptible during all phases.
5) Which of the following is the best definition of generation time?
A
the time needed for nuclear division
B
the duration of log phase
C
the length of time needed for lag phase
D
the length of time needed for a cell to divide
6) Which group of microorganisms is most likely to spoil a freshwater trout preserved with salt?
A
psychrophiles
B
anaerobes
C
thermophiles
D
facultative halophiles
7) Patients with indwelling catheters (long-term tubes inserted into body orifices for drainage, such as through the urethra and into the urinary bladder) are susceptible to infections because
A
biofilms develop on catheters.
B
injected solutions are contaminated.
C
their immune systems are weakened.
D
all bacteria cause infections.
8) An isolated colony on a streak plate contains millions (or even billions) of identical cells all arising from one initial cell.
A
True
B
False
9) Most pathogenic bacteria are thermophiles.
A
False
B
True
10) Nitrogen-fixing bacteria, such as cyanobacteria, can use atmospheric nitrogen (N2) for their nitrogen source.
A
True
B
False
11) The source of nutrient(s) in nutrient agar is
A
peptone and beef extract.
B
peptone and NaCl.
C
All of these
D
agar and NaCl.
*select an answer for all questions
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