Question 1

Surfactants work by

Accepted Answer

A) coating the organism preventing interaction with its environment. 
B) blocking transport into the organism. 
C) blocking transport out from the organism. 
D) disrupting membrane integrity. 
A) coating the organism preventing interaction with its environment. 
B) blocking transport into the organism. 
C) blocking transport out from the organism. 
D) disrupting membrane integrity.

Question 2

Chlorine and ethylene oxide are sterilizing gases.

Accepted Answer

A) True 
 B)False

Question 3

Each of the following is a target of antimicrobial agents except

Accepted Answer

A) cell walls. 
B) cell membranes. 
C) ribosomes. 
D) cellular proteins. 
E) cytoplasm. 
A) cell walls. 
B) cell membranes. 
C) ribosomes. 
D) cellular proteins. 
E) cytoplasm.

Question 4

The lowest temperature needed to kill or inactivate all microbes in 10 minutes is the

Accepted Answer

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

Question 5

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. 
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 6

Sterilization is achieved by

Accepted Answer

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

Question 7

Which of the following is not a heavy metal?

Accepted Answer

A) tincture of iodine 
B) merthiolate 
C) silver nitrate solution 
D) zinc 
E) mercurochrome 
A) tincture of iodine 
B) merthiolate 
C) silver nitrate solution 
D) zinc 
E) mercurochrome

Question 8

Which of the following is not a primary target of milk pasteurization?

Accepted Answer

A) Salmonella 
B) Campylobacter jejuni 
C) Lactobacillus 
D) Listeria monocytogenes 
E) Brucella 
A) Salmonella 
B) Campylobacter jejuni 
C) Lactobacillus 
D) Listeria monocytogenes 
E) Brucella

Question 9

Pasteurization is used to sterilize milk.

Accepted Answer

A) True 
 B)False

Question 10

The method of removing vegetative microbial life forms and debris to reduce contamination to safe levels is termed

Accepted Answer

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

Question 11

Pasteurization does not inactivate endospores or thermoduric microbes.

Accepted Answer

A) True 
 B)False

Question 12

Removal of moisture by dehydration is called

Accepted Answer

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

Question 13

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

Accepted Answer

A) Iodine 
B) Chlorine 
C) Bromine 
D) Fluorine 
E) Betadine 
A) Iodine 
B) Chlorine 
C) Bromine 
D) Fluorine 
E) Betadine

Question 14

You have some old plastic Petri dishes that you would like to use for pouring bacteriological agar plates.The only method of physical sterilization is ultraviolet radiation sterilization with your UV light (you cannot use the autoclave because it will disfigure and melt the plastic).After sterilizing the plates,pouring the sterilized agar medium,and then leaving the plates out at room temperature for a day or two to let them solidify and dry,you find contaminating bacterial colonies growing on the agar.Predict what has happened in this situation.

Accepted Answer

A) The agar had bacteria in it,even after sterilization in the autoclave. 
B) The lids of the Petri dishes were inadvertently left on while being sterilized. 
C) The room temperature enhanced the growth of normal biota of the agar. 
D) Air got into the poured agar plates,contaminating them. 
A) The agar had bacteria in it,even after sterilization in the autoclave. 
B) The lids of the Petri dishes were inadvertently left on while being sterilized. 
C) The room temperature enhanced the growth of normal biota of the agar. 
D) Air got into the poured agar plates,contaminating them.

Question 15

Which of the following germicides is/are also sporicidal?

Accepted Answer

A) Betadine 
B) chlorine 
C) phenolics 
D) chlorhexidine 
E) chlorine,chlorhexidine,and Betadine 
A) Betadine 
B) chlorine 
C) phenolics 
D) chlorhexidine 
E) chlorine,chlorhexidine,and Betadine

Question 16

Disinfection of beverages such as apple juice,milk,and wine is optimally achieved by

Accepted Answer

A) pasteurization. 
B) chlorination. 
C) moist heat autoclave. 
D) filtration. 
E) boiling water. 
A) pasteurization. 
B) chlorination. 
C) moist heat autoclave. 
D) filtration. 
E) boiling water.

Question 17

You have inherited some old glass baby milk bottles from your grandmother and you would like to use them instead of plastic bottles.The bottles are placed into a large metal container and placed in the oven,at 325 degrees F for about 2 hours.What factor would you change if you wanted the sterilization to occur much quicker?

Accepted Answer

A) Use a pressure cooker to sterilize the bottles,in steam. 
B) Increase the temperature of the oven by 5 degrees. 
C) Pour an antimicrobial chemical into the bottles before placing into the oven. 
D) Place the bottles outside in the sunlight and then place in the oven. 
A) Use a pressure cooker to sterilize the bottles,in steam. 
B) Increase the temperature of the oven by 5 degrees. 
C) Pour an antimicrobial chemical into the bottles before placing into the oven. 
D) Place the bottles outside in the sunlight and then place in the oven.

Question 18

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

Question 19

Ozone is a very effective disinfectant.

Accepted Answer

A) True 
 B)False

Question 20

Iodophors include

Accepted Answer

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

Exam 11: Physical and Chemical Control of Microbes

Surfactants work by

Chlorine and ethylene oxide are sterilizing gases.

Each of the following is a target of antimicrobial agents except

The lowest temperature needed to kill or inactivate all microbes in 10 minutes is the

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

Sterilization is achieved by

Which of the following is not a heavy metal?

Which of the following is not a primary target of milk pasteurization?

Pasteurization is used to sterilize milk.

The method of removing vegetative microbial life forms and debris to reduce contamination to safe levels is termed

Pasteurization does not inactivate endospores or thermoduric microbes.

Removal of moisture by dehydration is called

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

Which of the following germicides is/are also sporicidal?

Disinfection of beverages such as apple juice,milk,and wine is optimally achieved by

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

Ozone is a very effective disinfectant.

Iodophors include

The Main Themes of Microbiology

The Chemistry of Biology

Tools of the Laboratory: Methods for the Culturing of Microscopic Analysis of Microorganisms

Prokaryotic Profiles: The Bacteria and Archaea

Eukaryotic Cells and Microorganisms

An Introduction to the Viruses

Microbial Nutrition, Ecology, and Growth

Microbial Metabolism: the Chemical Crossroads of Life

Microbial Genetics

Genetic Engineering and Recombinant Dna

Drugs, Microbes, host-The Elements of Chemotherapy

Microbe-Human Interactions: Infection and Disease

Host Defenses I: Overview and Nonspecific Defenses

Host Defenses II: Specific Immunity and Immunization

Disorders in Immunity

Diagnosing Infections

Infectious Diseases Affecting the Skin and Eyes

Infectious Diseases Affecting the Nervous System

Infectious Diseases Affecting the Cardiovascular and Lymphatic Systems

Infectious Diseases Affecting the Respiratory System

Infectious Diseases Affecting the Gastrointestinal Tract

Infectious Diseases Affecting the Genitourinary System

Microbes and the Environment

Applied Microbiology and Food and Water Safety

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