Question 1

Which of the following does not affect microbial nucleic acids?

Accepted Answer

A)   Moist heat
B)   Ultraviolet light
C)   X rays
D)   Ethylene dioxide
E)   Formaldehyde

Question 2

Hydrogen peroxide is used in the process of sterilizing instruments such as endoscopes.

Accepted Answer

A) True 
 B)False

Question 3

The alcohol wipe used on a patient's skin before an injection is an example of ______.

Accepted Answer

A)   antisepsis
B)   disinfection
C)   sterilization
D)   decontamination
E)   sanitization

Question 4

Removal of moisture by dehydration is called ______.

Accepted Answer

A)   pasteurization
B)   ﬂash freeze
C)   lyophilization
D)   desiccation
E)   sterilization D

Question 5

Cold temperatures are considered microbistatic, whereas excessive heat is considered microbicidal. This is due to the fact that _______.

Accepted Answer

A)   in cold temperatures, the energy of activation is not suﬃcient to drive chemical reactions regardless of the presence of enzymes, whereas excessive heat denatures enzymesAnd/or incinerates the cell causing irreparable damage
B)   cold temperatures denature enzymes causing irreparable damage to the cell, whereas heat limits the energy of activation available to drive chemical reactions
C)   cold temperatures freeze and therefore kill the cell, whereas excess heat keeps the cell metabolically active but not dividing
D)   cold temperatures halt binary ﬁssion and is therefore considered a sterilant, whereas heat does not kill spores so it is not an effective method of control

Question 6

Which of the following represents the use of osmotic pressure as a microbial control method?

Accepted Answer

A)   Bleaching a kitchen counter
B)   Salting of meat
C)   Rinsing of a cut with Betadine
D)   Exposing dental equipment to UV light

Question 7

All of the following pertain to hypochlorites except _______.

Accepted Answer

A)   they are found in iodophors
B)   they are used to disinfect dairy, restaurant, and medical equipment
C)   they are found in common household bleach
D)   they release hypochlorous acid in solution
E)   they cause denaturation of enzymes

Question 8

Alcohols are more effective at inactivating enveloped viruses than naked viruses.

Accepted Answer

A) True 
 B)False

Question 9

Surgeons preparing for an invasive surgical procedure will scrub their hands thoroughly, and then they use a strong alcohol-based hand sanitizer which renders their hands sterile.

Accepted Answer

A) True 
 B)False

Question 10

Which of the following is not true of glutaraldehyde?

Accepted Answer

A)   It cross-links proteins on cell surfaces.
B)   It is classi?ed as a carcinogen.
C)   It does not damage plastics.
D)   It inactivates viruses.
E)   It inactivates endospores in 3 hours.

Question 11

The sterilizing gas used in chemiclaves is ______.

Accepted Answer

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

Question 12

Your friend Joe recently visited the doctor for steroid injections into his knee to reduce swelling due to a previous knee injury. Within a couple of days, he had an infection caused by Pseudomonas, a very pathogenic and drug resistant bacterium. Luckily, Joe went to the doctor immediately and received antibiotics. The doctor tells him that the same problem has occurred to many other people across the United States. Predict the most likely cause of this situation.

Accepted Answer

A)   The bacterium is normally on the skin of people, so can easily access the patient's blood during the needle stick.
B)   The needles were re-used and already contaminated before being used on the patients.
C)   The staff giving the steroid injections did not use proper aseptic technique.
D)   The steroid was contaminated at the production plant, so multiple batches of that drug made at that plant were contaminated with that bacterium.

Question 13

Which of the following acids is not used to destroy or inhibit microbial cells in food?

Accepted Answer

A)   Lactic acid
B)   Benzoic acid
C)   Phosphoric acid
D)   Propionic acid
E)   Acetic acid

Question 14

Iodophors include ______.

Accepted Answer

A)   alcohols
B)   chlorhexidine
C)   tincture of iodine
D)   chloramines
E)   betadine

Question 15

Which of the following items are typically irradiated in order to kill microbes?

Accepted Answer

A)   Cured meats
B)   Human tissues such as heart valves and skin
C)   Operating room air
D)   Surgical gloves
E)   All of the choices are correct.

Question 16

Which of the following methods of microbial control is mismatched?

Accepted Answer

A)   Exposure of surgical equipment to ultraviolet light - radiation
B)   Autoclaving nutrient agar before pouring into Petri plates - sterilization
C)   Heating a liquid to 71.6oC for 15 seconds - pasteurization
D)   Pickling eggs - osmotic pressure D

Question 17

Which of the following microbial forms has the highest resistance to physical and chemical controls?

Accepted Answer

A)   Naked viruses
B)   Protozoan cysts
C)   Fungal spores
D)   Bacterial endospores
E)   Yeast

Question 18

The removal of all life forms from inanimate objects is termed ______.

Accepted Answer

A)   antisepsis
B)   disinfection
C)   sterilization
D)   decontamination
E)   degerming

Question 19

Which of the following is true regarding the use of osmotic pressure as an antimicrobial agent?

Accepted Answer

A)   Exposing organisms to the air on a benchtop so they completely dry out is an example of using osmotic pressure as a means of microbial control.
B)   Salt is an effective solute to create an osmotic pressure gradient outside of a cell; however, the use of sugar, such as in jams and jellies, works via a different mechanism.
C)   Salts and sugars external to a microbe create a hypotonic environment, which causes lysis of the cell.
D)   Exposing a microbe to a hypertonic environment draws water out of the cell, causing plasmolysis.

Question 20

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 D

Exam 11: Physical and Chemical Control of Microbes

Which of the following does not affect microbial nucleic acids?

Correct Answer
verified

Hydrogen peroxide is used in the process of sterilizing instruments such as endoscopes.

Correct Answer
verified

The alcohol wipe used on a patient's skin before an injection is an example of ______.

Correct Answer
verified

Removal of moisture by dehydration is called ______.

Correct Answer
verified
D

Cold temperatures are considered microbistatic, whereas excessive heat is considered microbicidal. This is due to the fact that _______.

Correct Answer
verified

Which of the following represents the use of osmotic pressure as a microbial control method?

Correct Answer
verified

All of the following pertain to hypochlorites except _______.

Correct Answer
verified

Alcohols are more effective at inactivating enveloped viruses than naked viruses.

Correct Answer
verified

Surgeons preparing for an invasive surgical procedure will scrub their hands thoroughly, and then they use a strong alcohol-based hand sanitizer which renders their hands sterile.

Correct Answer
verified

Which of the following is not true of glutaraldehyde?

Correct Answer
verified

The sterilizing gas used in chemiclaves is ______.

Correct Answer
verified

Correct Answer
verified

Which of the following acids is not used to destroy or inhibit microbial cells in food?

Correct Answer
verified

Iodophors include ______.

Correct Answer
verified

Which of the following items are typically irradiated in order to kill microbes?

Correct Answer
verified

Which of the following methods of microbial control is mismatched?

Correct Answer
verified
D

Which of the following microbial forms has the highest resistance to physical and chemical controls?

Correct Answer
verified

The removal of all life forms from inanimate objects is termed ______.

Correct Answer
verified

Which of the following is true regarding the use of osmotic pressure as an antimicrobial agent?

Correct Answer
verified

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

Correct Answer
verified
D

Exam 11: Physical and Chemical Control of Microbes

Which of the following does not affect microbial nucleic acids?

Correct AnswerverifiedShow Answer

Hydrogen peroxide is used in the process of sterilizing instruments such as endoscopes.

Correct AnswerverifiedShow Answer

The alcohol wipe used on a patient's skin before an injection is an example of ______.

Correct AnswerverifiedShow Answer

Removal of moisture by dehydration is called ______.

Correct AnswerverifiedD

Cold temperatures are considered microbistatic, whereas excessive heat is considered microbicidal. This is due to the fact that _______.

Correct AnswerverifiedShow Answer

Which of the following represents the use of osmotic pressure as a microbial control method?

Correct AnswerverifiedShow Answer

All of the following pertain to hypochlorites except _______.

Correct AnswerverifiedShow Answer

Alcohols are more effective at inactivating enveloped viruses than naked viruses.

Correct AnswerverifiedShow Answer

Surgeons preparing for an invasive surgical procedure will scrub their hands thoroughly, and then they use a strong alcohol-based hand sanitizer which renders their hands sterile.

Correct AnswerverifiedShow Answer

Which of the following is not true of glutaraldehyde?

Correct AnswerverifiedShow Answer

The sterilizing gas used in chemiclaves is ______.

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Which of the following acids is not used to destroy or inhibit microbial cells in food?

Correct AnswerverifiedShow Answer

Iodophors include ______.

Correct AnswerverifiedShow Answer

Which of the following items are typically irradiated in order to kill microbes?

Correct AnswerverifiedShow Answer

Which of the following methods of microbial control is mismatched?

Correct AnswerverifiedD

Which of the following microbial forms has the highest resistance to physical and chemical controls?

Correct AnswerverifiedShow Answer

The removal of all life forms from inanimate objects is termed ______.

Correct AnswerverifiedShow Answer

Which of the following is true regarding the use of osmotic pressure as an antimicrobial agent?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedD

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
D

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
D

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
D