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.   organotrophs
B.   autotrophs
C.   chemotrophs
D.   prototrophs
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.   thermophiles
D.   mesophiles
Question #3
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 #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 killed by oxygen
B.   organism are aerobes
C.   organism is an obligate anaerobe.
D.   organism should be grown in an anaerobic chamber
Question #5
Which of the following is the suitable temperature range for mesophiles?
A.   20-30°C
B.   None of these
C.   >40°C
D.   25-40°C
Question #6
Starvation proteins are produced by a culture during which of the following segments of the growth curve?
A.   Exponential phase
B.   Lag phase
C.   Stationary phase
D.   Decline/death phase
Question #7
In the exponential phase, the cells and cell mass:
A.   first increases then decreases
B.   decreases
C.   double at a constant rate
D.   are constant
Question #8
Which of the following statements is true for all organisms?
A.   they require organic nutrients
B.   they require oxygen gas
C.   they require extremely low pH
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.   rise in cell density
C.   accumulation of toxic metabolites and exhaustion of nutrient
D.   rise in cell density, accumulation of toxic metabolites, and exhaustion of nutrient
Question #10
An organism has an optimal growth rate when the hydrogen ion concentration is very high. This organism is:
A.   halophile
B.   osmotolerant
C.   acidophile
D.   barophile

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