Micro Chapter 6 Question Preview (ID: 62594)


Micro Chapter 6. TEACHERS: click here for quick copy question ID numbers.

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
c)
d)

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.

Which group of microorganisms is most likely to spoil a freshwater trout preserved with salt?
a) psychrophiles
b) facultative halophiles
c) anaerobes
d) thermophiles

Which of the following is the best definition of generation time?
a) the time needed for nuclear division
b) the length of time needed for a cell to divide
c) the duration of log phase
d) the length of time needed for lag phase

During which growth phase will gram-positive bacteria be most susceptible to penicillin?
a) lag phase
b) The culture is equally susceptible during all phases.
c) stationary phase
d) log phase

Which of the following pairs of microbe classification terms and optimal growth temperatures is mismatched?
a) thermophile – growth at 37°C
b) psychrotroph – growth at 20-30°C
c) mesophile – growth at 25-40°C
d) psychrophile – growth at 15°C

Most bacteria grow best at pH
a) 1
b) 5
c) 7
d) 14

Salts and sugars work to preserve foods by creating a
a) depletion of nutrients.
b) hypotonic environment.
c) hypertonic environment.
d) lower pH.

Most pathogenic bacteria are thermophiles.
a) True
b) False
c)
d)

Nitrogen-fixing bacteria, such as cyanobacteria, can use atmospheric nitrogen (N2) for their nitrogen source.
a) True
b) False
c)
d)

The source of nutrient(s) in nutrient agar is
a) peptone and NaCl.
b) agar and NaCl.
c) peptone and beef extract.
d) All of these

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