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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
hypotonic environment.
C
depletion of nutrients.
D
hypertonic environment.
2) Most bacteria grow best at pH
A
7
B
14
C
5
D
1
3) Which of the following pairs of microbe classification terms and optimal growth temperatures is mismatched?
A
thermophile – growth at 37°C
B
psychrophile – growth at 15°C
C
psychrotroph – growth at 20-30°C
D
mesophile – growth at 25-40°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 length of time needed for lag phase
B
the duration of log phase
C
the length of time needed for a cell to divide
D
the time needed for nuclear division
6) Which group of microorganisms is most likely to spoil a freshwater trout preserved with salt?
A
facultative halophiles
B
psychrophiles
C
anaerobes
D
thermophiles
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
injected solutions are contaminated.
B
biofilms develop on catheters.
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
False
B
True
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
False
B
True
11) The source of nutrient(s) in nutrient agar is
A
peptone and beef extract.
B
All of these
C
peptone and NaCl.
D
agar and NaCl.
*select an answer for all questions
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