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Microbiolgy

Chapter 6,9,10

QuestionAnswer
In microbiology, the term growth usually refers to an increase in the number of microbial cells.
A(n) __________ organism is one that requires oxygen for growth obligate aerobic
A microbe that grows only at the bottom of a tube of thioglycollate medium is probably a(n) obligate anaerobe.
A microbiologist inoculates a growth medium with 100 bacterial cells/ml. If the generation time of the species is 1 hour, and there is no lag phase, how long will it be before the culture contains more than 10,000 cells/ml? 7 hours
Which of the following measurement techniques would be useful to quantify a species of bacteria that is difficult to culture? microscopic counts
The use of salt and sugar in preserving various types of foods is an application of which of the following concepts? osmotic pressure
The method of obtaining isolated cultures that utilizes surface area to dilute specimens is called the streak-plate technique
__________ are complex communities of various types of microbes that adhere to surfaces. Biofilms
During the __________ of growth, cells are dying faster than new cells are being produced. death phase
A microorganism found living under conditions of high __________ is a barophile. hydrostatic pressure
Which of the following is an example of sanitization? A public toilet is treated with disinfectants.
Aseptic means free of pathogens
Which of the following is NOT an effective means of sterilization? lyophilization
Which of the following describes flash pasteurization? heating at 72°C for 15 seconds
Which of the following types of radiation is nonionizing and has the shortest wavelength? ultraviolet light
Lysol is an example of which of the following groups of chemical antimicrobial agents? phenolics
Which of the following is the most appropriate pairing of microbe and biosafety level? methicillin-resistant Staphylococcus aureus (MRSA), BSL-2
Betadine is an example of which of the following groups of antimicrobial agents? halogens
Which of the following was used in the past to prevent the transmission of gonorrhea from an infected mother to her newborn? silver nitrate
The process of incineration is used for sterilization.
A large percentage of antibiotics and semisynthetic drugs are produced by members of the genus Streptomyces.
An antimicrobial that inhibits cell wall synthesis will result in which of the following? Cells become more susceptible to osmotic pressure.
Which of the following is a primary advantage of semisynthetic drugs? They have a broader spectrum of action
Which scientist coined the term antibiotic Waksman
Which of the following statements about the zone of inhibition is FALSE? The larger the zone, the more resistant the organism is.
Another term for the Kirby-Bauer test is the diffusion susceptibility test
Which of the following groups of drugs can become incorporated into the bones and teeth of a fetus? tetracyclines
Probiotics are an alternative to the use of chemotherapy involving microbial antagonism
It is inappropriate to prescribe antibacterial agents to treat colds or flu because these diseases are caused by viruses.
Which of the following is NOT a criterion by which all antimicrobial agents can be evaluated? their activity against cell walls
Created by: dmcgowan23
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