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.   autotrophs
B.   chemotrophs
C.   prototrophs
D.   organotrophs
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.   psychrophiles
C.   mesophiles
D.   thermophiles
Question #3
Generation time is:
A.   time required for the population to double
B.   time required for the initial adjustment
C.   the same for all microorganisms
D.   the amount of time needed for the cell to get larger
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
Which of the following is the suitable temperature range for mesophiles?
A.   None of these
B.   20-30°C
C.   25-40°C
D.   >40°C
Question #6
Starvation proteins are produced by a culture during which of the following segments of the growth curve?
A.   Lag phase
B.   Decline/death phase
C.   Stationary phase
D.   Exponential phase
Question #7
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 #8
Which of the following statements is true for all organisms?
A.   they require extremely low pH
B.   they require organic nutrients
C.   they require oxygen gas
D.   they require inorganic nutrients
Question #9
Exponential phase of growth curve of bacteria is of limited duration because of:
A.   accumulation of toxic metabolites
B.   accumulation of toxic metabolites and exhaustion of nutrient
C.   rise in cell density, accumulation of toxic metabolites, and exhaustion of nutrient
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.   acidophile
B.   barophile
C.   osmotolerant
D.   halophile

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