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.   autotrophs
B.   chemotrophs
C.   prototrophs
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.   osmotolerant
C.   barophile
D.   halophile
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.   Exponential phase
D.   Lag 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 should be grown in an anaerobic chamber
C.   organism are aerobes
D.   organism is killed by oxygen
Question #5
Generation time is:
A.   time required for the population to double
B.   the amount of time needed for the cell to get larger
C.   time required for the initial adjustment
D.   the same for all microorganisms
Question #6
Which of the following is the suitable temperature range for mesophiles?
A.   20-30°C
B.   >40°C
C.   25-40°C
D.   None of these
Question #7
Exponential phase of growth curve of bacteria is of limited duration because of:
A.   accumulation of toxic metabolites
B.   all of these
C.   exhaustion of nutrient
D.   rise in cell density
Question #8
In the exponential phase, the cells and cell mass:
A.   double at a constant rate
B.   first increases then decreases
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.   hyperthermophiles
B.   mesophiles
C.   psychrophiles
D.   thermophiles
Question #10
Which of the following statements is true for all organisms?
A.   they require organic nutrients
B.   they require inorganic nutrients
C.   they require extremely low pH
D.   they require oxygen gas

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