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Post-Test
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1
Which one of the following is not a form of symbiotic relationship?
A)Parasitic
B)Mutualistic
C)Syntrophy
D)Consortia
E)All of the choices are forms of symbiotic relationships.
2
Microbes capable of nitrogen fixation are classified as
A)cyanobacteria.
B)nitrotrophs.
C)mezotrophs.
D)diazotrophs.
E)biofilms.
3
True or False: Although prokaryotic species reproduce by simply splitting in two, they are able to acquire additional genes from other members of their species or even other species.
A)True
B)False
4
Microorganisms classified as _______________ require O2, while microorganisms classified as _________ can use O2 but can also perform respiration if no O2 is available.
A)photoautotrophs; photoheterotrophs
B)facultative aerobes; obligate anaerobes
C)obligate anaerobes; aerotolerant anaerobes
D)obligate aerobes; facultative aerobes
E)aerotolerant anaerobes; obligate aerobes
5
Organisms, such as some aerobic archaea, consume methane gas and remove it from the earth's atmosphere, maintaining a balance of methane in the atmosphere are most accurately referred to as
A)pathogens.
B)producers.
C)decomposers.
D)methanotrophs.
E)methanogens.
6
Which one of the following is a characteristic of the Archaea?
A)Their membrane lipids are formed by ester linkages
B)Most grow in moderate environments
C)Their DNA is wrapped around histones
D)Their cell walls are composed of peptidoglycan
E)All of the choices are characteristics of the Archaea.
7
An archaeal species that can only grow at extremely high temperatures would most accurately be referred to as
A)hyperthermophilic.
B)thermotolerant.
C)halophilic.
D)methanogenic.
E)barophilic.
8
The Chlamydiae phylum of bacteria is best known for
A)radiation resistance.
B)nitrogen fixation.
C)intracellular parasitism.
D)anoxygenic photosynthesis.
E)distinctive corkscrew shapes.
9
True or False: In the prokaryotic world, extremophiles are archaea, and organisms that exclusively favor more moderate conditions are bacteria.
A)True
B)False
10
To which genera of the Proteobacteria is the ancestry of mitochondria most likely linked?
A)Alpha
B)Beta
C)Gamma
D)Delta
E)Epsilon
11
Which one of the following statements about Cyanobacteria is incorrect
A)Cyanobacteria are the only prokaryotes to produce oxygen as a product of photosynthesis.
B)Modern chloroplasts are believed to be derived from Cyanobacteria.
C)Some cyanobacteria display intercellular chemical communication.
D)Wavelengths of light not well absorbed by chlorophyll in Cyanobacteria are absorbed by an accessory pigment called phycobilin.
E)All of the statements about Cyanobacteria are correct.
12
Approximately what percentage of the E. coli genome consists of genes believed to result from horizontal gene transfer with other bacterial species?
A)1%
B)17%
C)55%
D)77%
E)98%
13
True or False: Although bacteria do not exhibit traditional organelles like lysosomes or endoplasmic reticulum, some bacterial species do develop membrane-bound structures that play important cellular roles.
A)True
B)False
14
Some bacteria cells exhibit the ability to signal surrounding cells to behave collectively. This is most accurately referred to as
A)bacterial signaling.
B)group response.
C)quorum sensing.
D)biofilm formation.
E)bacterial cells are unable to signal other surrounding cells.
15
Which of the following macromolecules can be found in the slimy capsule surrounding some bacterial cells?
A)Protein
B)Nucleic acid
C)Polysaccharide
D)Protein and polysaccharide
E)Protein, nucleic acid, and polysaccharide
16
Gram negative bacteria typically have _____ peptidoglycan layer and ________ envelope.
A)a thick; a lipopolysaccharide
B)a thin; a lipopolysaccharide
C)a thick; no
D)a thin; no
E)no; a lipopolysaccharide
17
Which one of the following statements about bacterial flagella is incorrect? Bacterial flagella
A)lack a regular arrangement of microtubules.
B)lack dyenin protein.
C)lack a plasma membrane covering.
D)move by repeated cycles of bending and straightening.
E)are composed of flagellin.
18
True or False: Fluoresence in situ hybridization (FISH) technique is used to quantify bacteria that are unable to be cultured in the laboratory.
A)True
B)False
19
Which one of the following is not one of Koch's postulates?
A)The presence of a suspected pathogen must correlate with occurrence of symptoms.
B)A suspected pathogen isolated from an infected host should cause disease when inoculated into a healthy host.
C)Non-virulent strains of a suspected pathogen should be found in uninfected hosts.
D)If a healthy host is inoculated with a suspected pathogen, the same suspected pathogen should be able to be isolated from the now-infected host.
E)All of the choices represent Koch's postulates.
20
True or False: The use of bacteria to break down organic compounds such as petroleum, sewage and industrial discharges is known as bioremediation.
A)True
B)False







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