Bio 2010 - Microbiology » Summer 2021 » Chapter 6 Quiz

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Question #1
Organisms which obtain their energy from chemicals are designated as:
A.   organotrophs
B.   prototrophs
C.   autotrophs
D.   chemotrophs
Question #2
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.   hyperthermophiles
B.   thermophiles
C.   psychrophiles
D.   mesophiles
Question #3
Generation time is:
A.   time required for the initial adjustment
B.   the amount of time needed for the cell to get larger
C.   time required for the population to double
D.   the same for all microorganisms
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 is an obligate anaerobe.
B.   organism are aerobes
C.   organism should be grown in an anaerobic chamber
D.   organism is killed by oxygen
Question #5
Which of the following is the suitable temperature range for mesophiles?
A.   None of these
B.   >40°C
C.   20-30°C
D.   25-40°C
Question #6
Starvation proteins are produced by a culture during which of the following segments of the growth curve?
A.   Decline/death phase
B.   Exponential phase
C.   Stationary phase
D.   Lag phase
Question #7
In the exponential phase, the cells and cell mass:
A.   decreases
B.   are constant
C.   first increases then decreases
D.   double at a constant rate
Question #8
Which of the following statements is true for all organisms?
A.   they require organic nutrients
B.   they require inorganic nutrients
C.   they require oxygen gas
D.   they require extremely low pH
Question #9
Exponential phase of growth curve of bacteria is of limited duration because of:
A.   accumulation of toxic metabolites and exhaustion of nutrient
B.   rise in cell density, accumulation of toxic metabolites, and exhaustion of nutrient
C.   accumulation of toxic metabolites
D.   rise in cell density
Question #10
An organism has an optimal growth rate when the hydrogen ion concentration is very high. This organism is:
A.   barophile
B.   halophile
C.   acidophile
D.   osmotolerant

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