C HAPTER 20: M ICROBIAL E COSYSTEMS
Test Bank for Brock Biology of Microorganism 16th Edition by Michael T.
Madigan
20.1 Multiple Choice Questions
1. Which metric describes the proportion of EACH species present in a
communit y?
A) species abundance
B) species diversit y
C) species evenness
D) species richness
2. Which of the following represents increasing microbial diversity?
A) guild-communit y-population
B) population-guild-communit y
C) cell-communit y-population
D) communit y-guild-population
3. Biofilm structure is determined by
A) nutritional factors.
B) signaling factors.
C) the local environment.
D) the local environment, nutritional factors, and signal ing molecules.
4. ________ are the main primary producers in freshwater environments.
A) Phototrophic microorganisms
B) Heterotrophic microorganisms
C) Chemolithotrophic microorganisms
, D) Viral microorganisms
5. The abundance of cyanobacterial mats has greatl y decli ned due to the
evolution of
A) antimicrobial-producing fungi.
B) bacteriophages.
C) animal grazers.
D) Proteobacteria.
6. Ecological theory states that for every organism there is at LEAST one
_________, and the microenvironment where the organism is most
successful is called the __________.
A) population / communit y
B) niche / prime niche
C) prime niche / niche
D) communit y / population
7. Which of the following is an example of a biofilm?
A) transient skin microbes
B) dental plaque
C) marine diatoms
D) a planktonic microcolony
8. The generation time of Escherichia coli in the human intestine is
________ in laboratory culture.
A) at about the same rate as
B) faster than
C) more optimal than
D) slower than
9. In a stratified lake, the warmer and less dense layer is called the
A) epilimnion.
Test Bank for Brock Biology of Microorganism 16th Edition by Michael T.
Madigan
20.1 Multiple Choice Questions
1. Which metric describes the proportion of EACH species present in a
communit y?
A) species abundance
B) species diversit y
C) species evenness
D) species richness
2. Which of the following represents increasing microbial diversity?
A) guild-communit y-population
B) population-guild-communit y
C) cell-communit y-population
D) communit y-guild-population
3. Biofilm structure is determined by
A) nutritional factors.
B) signaling factors.
C) the local environment.
D) the local environment, nutritional factors, and signal ing molecules.
4. ________ are the main primary producers in freshwater environments.
A) Phototrophic microorganisms
B) Heterotrophic microorganisms
C) Chemolithotrophic microorganisms
, D) Viral microorganisms
5. The abundance of cyanobacterial mats has greatl y decli ned due to the
evolution of
A) antimicrobial-producing fungi.
B) bacteriophages.
C) animal grazers.
D) Proteobacteria.
6. Ecological theory states that for every organism there is at LEAST one
_________, and the microenvironment where the organism is most
successful is called the __________.
A) population / communit y
B) niche / prime niche
C) prime niche / niche
D) communit y / population
7. Which of the following is an example of a biofilm?
A) transient skin microbes
B) dental plaque
C) marine diatoms
D) a planktonic microcolony
8. The generation time of Escherichia coli in the human intestine is
________ in laboratory culture.
A) at about the same rate as
B) faster than
C) more optimal than
D) slower than
9. In a stratified lake, the warmer and less dense layer is called the
A) epilimnion.
