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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. |
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| 2 | |
Microbes capable of nitrogen fixation are classified as |
| | A) | cyanobacteria. |
| | B) | nitrotrophs. |
| | C) | mezotrophs. |
| | D) | diazotrophs. |
| | E) | biofilms. |
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| 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 |
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| 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 |
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| 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. |
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| 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. |
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| 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. |
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| 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. |
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| 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 |
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| 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 |
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| 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. |
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| 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% |
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| 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 |
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| 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. |
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| 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 |
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| 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 |
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| 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. |
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| 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 |
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| 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. |
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| 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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