Bio 2010 - Microbiology » Spring 2023 » Chapter 6 Quiz

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

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