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TCC Nebauer Ch6 Quiz
| Question | Answer |
|---|---|
| A cell which uses an organic carbon source and obtains energy from light would be called a(n) Answer A. chemoheterotroph. B. chemoautotroph. C. photoautotroph. D. photoheterotroph. | D. photoheterotroph |
| Which of the following forms of oxygen is often used by phagocytic cells to destroy pathogens? A. singlet oxygen B. peroxide anions C. hydroxyl radicals D. superoxide radicals | A singlet oxygen |
| Why do bacteral culturs go thru lag phase A DNA & protein synthesis in the culture has not caught up with cell division B they R synthesizing new enzymes to use nutrients in their medium C beginning to die D exposed to large amounts of own waste produ | B Because they are synthesizing new enzymes in order to use nutrients in their medium. |
| All R drawbaks to the use of spectrophotometry in estimating microbial growth EXCEPT A can’t distinguish between live & dead cells B can’t be used if there R less than 1 million cells per ML C kills the organisms as they R being counted D It will | C kills the organisms as they R being counted |
| All of the following are direct methods of measuring microbial growth except: A viable plate counts. B turbidity. C membrane filtration. D a Coulter counter. | B turbidity. |
| If a cell counter slide is determined to have a mean number of 20 bacterial cells per square, the total number of bacteria per ml of culture would be: A 1,000,000 B 25,000,000 C 50,000,000 D Unable to determine | B 25,000,000 |
| Kineococcus radiotolerans is an example of which of the following? A a psychrophile B a barophile C an extremophile D a mesophile | C an extremophile |
| These microbes do not have an aerobic metabolism, but they can detoxify oxygen enough to live in its presence: A microaerophiles B erotolerant anaerobes C facultative anaerobes D obligate anaerobes | aerotolerant anaerobes |
| Which of the following pH levels would probably be lethal to an alkalinophile? A pH 10 B pH 8 C pH 14 D pH 4 | D pH 4 |
| All of the following are associated with the streak plate method of isolation EXCEPT A isolation of CFU's from one another B colonies growing at and below the surface of the medium C a sterile inoculating loop or needle D a solid medium in a Petri | B colonies growing at and below the surface of the medium. |
| Organic molecules that organisms need, but cannot synthesize all by themselves, are called ____________________. A growth factors. B trace elements. C nutrients. D carotenoids. | A growth factors. |
| All statements concerning the bacterial growth curve R true EXCEPT B Cells divide at a maximal rate during the log phase C Under certain conditions, the log phase can be maintained indefinitely D death phase is reached, all cells in the culture have di | D death phase is reached, all cells in the culture have died |
| Which of the following elements is often growth limiting for organisms because of its limited availability? A oxygen B nitrogen C hydrogen D carbon | B nitrogen |
| Microbes living in geothermal springs are more likely to metabolize hydrogen than sulfur because B the by-products of sulfur metabolism a C they cannot obtain enoughO2to support sulfur metabolism D [H] is more plentiful in these environments than sulfu | they cannot obtain enough oxygen to support sulfur metabolism. |
| TheFollowingAreTrueStatements ConcerningTypesOfMediaEXCEPT ASyntheticMediumIs The Same Thing As A Defined Medium B Differential Media Often Involve Visible Changes In The Appearance Of Colonies C Media Can Be Either Selective Or Differential But Not Both | Media can be either selective or differential, but not both |
| ABacterialSpeciesHasBeen DeterminedToHave aGenerationTimeOf 30Min. If a Microbiologist Starts With An InoculumOf 1000 cells/ml, and wants to grow it to a culture of 1,000,000 cells/ml, approximately how long should the culture beIncubated A 5 B 24 C 10 | A 5 hours |
| The most destructive form of oxygen is ____________________. A the superoxide radical. B the hydroxyl radical. C singlet oxygen. D the peroxide anion. | B the hydroxyl radical. |
| A microbe isolated from deep in the ocean could be characterized as a ____________________. A barophile. B mesophile. C psychrophile. D Both A and C are correct. E A, B, and C are correct. | D Both A and C are correct. |
| The Following Are True Statements Regarding Clinical Specimens EXCEPT B UniversalPrecautionsAreObservedInOrderToProtectSpecimensFromContamination C OftenTransportedInSpecialMedia2HelpPreserveThem D MustBe Properly Labeled&Promptly Moved 2 The Laborato | B Universal precautions are observed in order to protect specimens from contamination |
| Why is agar a useful substance in the microbiology lab? | Agar does not solidify until it cools to about 40O C |
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sarah.teacher36
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