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.   halophile
B.   acidophile
C.   osmotolerant
D.   barophile
Question #3
Starvation proteins are produced by a culture during which of the following segments of the growth curve?
A.   Decline/death phase
B.   Stationary 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 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.   time required for the population to double
B.   time required for the initial adjustment
C.   the amount of time needed for the cell to get larger
D.   the same for all microorganisms
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.   all of these
B.   rise in cell density
C.   accumulation of toxic metabolites
D.   exhaustion of nutrient
Question #8
In the exponential phase, the cells and cell mass:
A.   double at a constant rate
B.   decreases
C.   first increases then 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.   mesophiles
B.   thermophiles
C.   psychrophiles
D.   hyperthermophiles
Question #10
Which of the following statements is true for all organisms?
A.   they require extremely low pH
B.   they require oxygen gas
C.   they require organic nutrients
D.   they require inorganic nutrients

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