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.   chemotrophs
B.   organotrophs
C.   autotrophs
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.   thermophiles
C.   mesophiles
D.   psychrophiles
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 should be grown in an anaerobic chamber
B.   organism is an obligate anaerobe.
C.   organism are aerobes
D.   organism is killed by oxygen
Question #5
Which of the following is the suitable temperature range for mesophiles?
A.   >40°C
B.   None of these
C.   25-40°C
D.   20-30°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.   double at a constant rate
B.   are constant
C.   first increases then decreases
D.   decreases
Question #8
Which of the following statements is true for all organisms?
A.   they require oxygen gas
B.   they require inorganic nutrients
C.   they require extremely low pH
D.   they require organic nutrients
Question #9
Exponential phase of growth curve of bacteria is of limited duration because of:
A.   rise in cell density
B.   accumulation of toxic metabolites
C.   rise in cell density, accumulation of toxic metabolites, and exhaustion of nutrient
D.   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.   barophile
B.   osmotolerant
C.   acidophile
D.   halophile

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