Bio 2010 - Microbiology » Summer 2022 » Chapter 6 Quiz

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Question #1
Organisms which obtain their energy from chemicals are designated as:
A.   prototrophs
B.   chemotrophs
C.   organotrophs
D.   autotrophs
Question #2
An organism has an optimal growth rate when the hydrogen ion concentration is very high. This organism is:
A.   osmotolerant
B.   barophile
C.   acidophile
D.   halophile
Question #3
Starvation proteins are produced by a culture during which of the following segments of the growth curve?
A.   Lag phase
B.   Exponential phase
C.   Decline/death phase
D.   Stationary phase
Question #4
A culture broth tube was very turbid at the surface but clear throughout the rest of the tube indicating that the
A.   organism should be grown in an anaerobic chamber
B.   organism are aerobes
C.   organism is killed by oxygen
D.   organism is an obligate anaerobe.
Question #5
Generation time is:
A.   the same for all microorganisms
B.   the amount of time needed for the cell to get larger
C.   time required for the initial adjustment
D.   time required for the population to double
Question #6
Which of the following is the suitable temperature range for mesophiles?
A.   20-30°C
B.   25-40°C
C.   None of these
D.   >40°C
Question #7
Exponential phase of growth curve of bacteria is of limited duration because of:
A.   rise in cell density
B.   accumulation of toxic metabolites
C.   all of these
D.   exhaustion of nutrient
Question #8
In the exponential phase, the cells and cell mass:
A.   first increases then decreases
B.   double at a constant rate
C.   are constant
D.   decreases
Question #9
Bacteria have been found in all of Earth's ecosystems. What term would generally refer to those found in the hottest locations on Earth (like the water geysers in Yellow Stone National Park)?
A.   psychrophiles
B.   mesophiles
C.   hyperthermophiles
D.   thermophiles

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