Micro Exam 2 - Module 5

Which method of microbial control is aimed at potential pathogens? A. Antisepsis B. Sterilization C. Commercial sterilization D. Sanitization

A. Antisepsis

Which one of the following would be the most likely to spoil a jar of jam in your fridge? A. Eurotium, a mold B. Pseudomonas, a psychotropic bacteria C. Thibacillus, an acidophile D. Streptococcus pyogenes, a human pathogen

A. Eurotium, a mold

Dry heat does not kill as effectively as moist heat. How can you increase the effectiveness of dry heat to match that of moist heat? A. increase the time of exposure B. Use a larger oven C. Use an oven that increases in temperature faster D. Use a gas oven as opposed to electric.

A. Increase the time of exposure

Pseudomonas species are unusually resistant to antimicrobial treatment due to the presence of _____. A. Porins B. A plasma membrane. C. An extremely hard cell wall D. Antibiotics

A. Porins

In the disk-diffusion method, a ___zone of inhibition around a filter soaked with a chemical indicates that the test bacteria is resistant to the chemical. A. Small B. Large C. Colored

A. Small

Which one of these biocidal treatments would not be effectie on surgical tongs wrapped in foil? A. UV light B. Gamma rays C. Dry heat oven

A. UV light

Which of the following can be used to sterilize a heat-sensitive solution? A. filtration B. pasteurization C. freezing D. dry oven

A. filtration

All media needs to be free of microbes, so you need to ___media before you use it. A. sterilize B. disinfect C. sanitize D. degerm

A. sterilize

Which of these is the most effective method of sterilization? A. a dry oven B. an autoclave C. pasteurization

B. An autoclave

Which of the following does not achieve sterilization? A. Radiation B. Pasteurization C. Autoclave D. Dry heat

B. Pasteurization

Which method of microbial control aims to destroy all microbes? A. Disinfection B. Sterilization C. Commercial sterilization D. Satitization

B. Sterilization

Even the worst tattoo artist recognizes the importance of using tattoo needles that are free of contamination. In order to conform to this principle, these types of tattoo needles would have to be _____prior to use. A. disinfected B. sterilized C. degermed D. sanitized

B. Sterilized

Which of these are most likely to survive in a hypertonic environment? A. bacteria B. molds C. viruses D. algae

B. molds

Restaurants use high temperature water to wash eating utensils in order to lower microbial counts to safe public health levels. This is an example of _______. A. antisepsis B. sanitization C. degerming D. sterilizing E. disinfection

B. sanitization

Which of the following treatments does not yield a sterile product? A. Ionizing radiation B. Autoclaving C. 0.45 um filtration D. Gamma radiation

C. 0.45 um filtration

A bacterial culture was treated at 55 C. Treating the culture for 5 and 10 minutes did not effectively kill the bacteria, but treatment for 15 minutes killed all the cells. What is the TDT? A. 5 mins B. 10 mins C. 15 mins D. more than 15 mins

C. 15 mins

If a disinfectant is used on a living tissue it is referred to as a _______. A. disinfectant B. sterilant C. antiseptic D. degerming agent

C. Antiseptic

What genus of bacteria tends to be unusually resistant to disinfectant and antibiotics? A. Escherichia B. Salmonella C. Pseudomonas D. Saccharomyces

C. Pseudomonas

Which of the following best describes the pattern of microbial death? A. The pattern varies depending on the species B. The pattern varies depending on the antimicrobial agent. C. The cells in a population die at a constant rate D. All the cells in a culture die at once

C. The cells in a population die at a constant rate.

Swabbing an injection site before giving an injection is an example of ________. A. antisepsis B. disinfection C. degerming D. sterilizing E. sanitization

C. degerming

Commercial sterilization involves heat treatment to destroy ______of bacteria. A. the plasma membrane B. peptidoglycan C. endospores D. the outer membrane

C. endospores

Which of these treatments is bacteriocidal? A. microwaves B. low temperature C. high pressure D. Dessication

C. high pressure

Which of the following is not used to preserve foods? A. dessication B. ionizing radiation C. microwaves D. osmotic pressure

C. microwaves

Bacterial death will result from damage to which of the following structures? A. Plasma membrane B. Proteins C. Nucleic acids D. All of the above

D. All of the above

Which of these is the most effective biocide? A. a microwave B. a deep freezer C. a filter D. a UV light lamp

D. a UV light lamp

Salts and sugars work to preserve foods by creating a _________ A. lower osmotic pressure B. hypotonic environment C. lower pH D. hypertonic environment

D. hypertonic environment

Which of the following is a limitation of the autoclave? A. Requires a long time to achieve sterilizatoin B. Cannot inactivate viruses C. Cannot kill endospores D. cannot be used with heat-sensitive materials.

D.Cannot be used with heat-sensitive materials

Which of these principles are not important when considering a disinfectant? A. The concentration of Disinfectant B. The material that the disinfected surface is composed of C. How clean the surface is D. How long the disinfectant makes contact E. What temperature the disinfectant is.

E. What temperature the disinfectant is.