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

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