Question 1

The chemical agent(s)  that produces highly reactive hydroxyl-free radicals and also decomposes to O2 gas is/ are

Accepted Answer

A)  Cidex.
B)  cationic detergents.
C)  hydrogen peroxide.
D)  chlorhexidine.
E)  iodophors.

Question 2

All of the following are methods of disinfection or sterilization, except

Accepted Answer

A)  gamma radiation.
B)  dry oven.
C)  lyophilization.
D)  triclosan.
E)  ethanol.

Question 3

The shortest time required to kill all the microbes in a sample at a specified temperature is called the

Accepted Answer

A)  thermal death point (TDP) .
B)  thermal death time (TDT) .
C)  sporicidal time.
D)  death phase point.

Question 4

Microbiological contaminants are best described as

Accepted Answer

A)  unwanted microbes present on or in a substance.
B)  any and all microbes present on or in a substance.
C)  pathogenic microbes present on or in a substance.
D)  vegetative microbes present on or in a substance.

Question 5

The sterilizing gas used in a special chamber is

Accepted Answer

A)  ethylene oxide.
B)  iodophor.
C)  glutaraldehyde.
D)  formaldehyde.
E)  chlorine dioxide.

Question 6

The compound that is an organic base containing chlorine and two phenolic rings and is used increasingly for hand scrubbing, neonatal washes, wound degerming, and prepping surgical skin sites is

Accepted Answer

A)  carbolic acid.
B)  chlorhexidine.
C)  triclosan.
D)  formalin.
E)  quarternary ammonium compounds.

Question 7

A microorganism that is not motile and has stopped metabolizing could be considered dead.

Accepted Answer

A) True 
 B)False

Question 8

Ethylene oxide is

Accepted Answer

A)  sporicidal.
B)  only effective with high heat.
C)  the active agent in household bleach.
D)  used as an antiseptic against anaerobes.
E)  a halogen.

Question 9

When a control agent targets the metabolic processes of microbial cells, active younger cells typically die more rapidly than older cells.

Accepted Answer

A) True 
 B)False

Question 10

Sterilization is achieved by

Accepted Answer

A)  flash pasteurization.
B)  hot water.
C)  boiling water.
D)  steam autoclave.
E)  All of these choices are correct.

Question 11

Physical agents for controlling microbial growth include all of the following, except

Accepted Answer

A)  ultraviolet radiation.
B)  boiling water.
C)  HEPA filters.
D)  pasteurization.
E)  hydrogen peroxide.

Question 12

Scrubbing or immersing the skin in chemicals to reduce the numbers of microbes on the skin is

Accepted Answer

A)  disinfection.
B)  sterilization.
C)  sanitization.
D)  degermation.

Question 13

All of the following are phenols or phenolics, except

Accepted Answer

A)  lysol.
B)  hexachlorophene.
C)  triclosan.
D)  cresols.
E)  chloramines.

Question 14

Moist heat damages microorganisms by

Accepted Answer

A)  oxidation of cellular components.
B)  damaging the phospholipid bilayer.
C)  damaging the cells nucleic acids.
D)  denaturing and coagulating cellular proteins.

Question 15

Historically, which of the following was instilled into the eyes of newborn infants to prevent gonococcal infections?

Accepted Answer

A)  triclosan
B)  formaldehyde
C)  phenol
D)  silver nitrate
E)  mercurochrome

Question 16

All of the following are major categories of microbial control methods except

Accepted Answer

A)  physical agents.
B)  chemical agents.
C)  mechanical removal methods.
D)  genetic methods.

Question 17

The presence of organic matter such as saliva and pus can interfere with the actions of disinfectants.

Accepted Answer

A) True 
 B)False

Question 18

The process of using a cleansing technique to mechanically remove and reduce microorganisms and debris to safe levels is

Accepted Answer

A)  disinfection.
B)  sterilization.
C)  antisepsis.
D)  sanitization.
E)  degermation.

Question 19

_____ radiation excites atoms to a higher energy state within molecules such as DNA that then leads to the formation of pyrimidine dimers.

Accepted Answer

Nonionizin...

Question 20

_____ is a halogen used in gaseous and liquid form for large scale disinfection of drinking water and sewage.

Accepted Answer

The answer of _____ is a halogen used in gaseous...

Exam 11: Physical and Chemical Agents for Microbial Control

All of the following are phenols or phenolics, except

Correct AnswerverifiedShow Answer

Moist heat damages microorganisms by

Correct AnswerverifiedShow Answer

Historically, which of the following was instilled into the eyes of newborn infants to prevent gonococcal infections?

Correct AnswerverifiedShow Answer

All of the following are major categories of microbial control methods except

Correct AnswerverifiedShow Answer

Microbiological contaminants are best described as

Correct AnswerverifiedShow Answer

The sterilizing gas used in a special chamber is

Correct AnswerverifiedShow Answer

All of the following are methods of disinfection or sterilization, except

Correct AnswerverifiedShow Answer

The presence of organic matter such as saliva and pus can interfere with the actions of disinfectants.

Correct AnswerverifiedShow Answer

_____ radiation excites atoms to a higher energy state within molecules such as DNA that then leads to the formation of pyrimidine dimers.

Correct AnswerverifiedNonionizin...View AnswerShow Answer

The chemical agent(s) that produces highly reactive hydroxyl-free radicals and also decomposes to O2 gas is/ are

Correct AnswerverifiedShow Answer

The shortest time required to kill all the microbes in a sample at a specified temperature is called the

Correct AnswerverifiedShow Answer

The compound that is an organic base containing chlorine and two phenolic rings and is used increasingly for hand scrubbing, neonatal washes, wound degerming, and prepping surgical skin sites is

Correct AnswerverifiedShow Answer

When a control agent targets the metabolic processes of microbial cells, active younger cells typically die more rapidly than older cells.

Correct AnswerverifiedShow Answer

Ethylene oxide is

Correct AnswerverifiedShow Answer

The process of using a cleansing technique to mechanically remove and reduce microorganisms and debris to safe levels is

Correct AnswerverifiedShow Answer

_____ is a halogen used in gaseous and liquid form for large scale disinfection of drinking water and sewage.

Correct AnswerverifiedShow Answer

Scrubbing or immersing the skin in chemicals to reduce the numbers of microbes on the skin is

Correct AnswerverifiedShow Answer

A microorganism that is not motile and has stopped metabolizing could be considered dead.

Correct AnswerverifiedShow Answer

Physical agents for controlling microbial growth include all of the following, except

Correct AnswerverifiedShow Answer

Sterilization is achieved by

Correct AnswerverifiedShow Answer

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Nonionizin...
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The chemical agent(s) that produces highly reactive hydroxyl-free radicals and also decomposes to O₂ gas is/ are

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