Microbiology: Chapter 8
- 1.
Which of these are reasons to control microbial growth? (Choose all that apply)
- A.
Prevention and treatment of infection
- B.
Prevention of infection
- C.
Is a form of secondary prevention
- D.
Prevention of food spoilage
Correct Answer(s)
A. Prevention and treatment of infection
B. Prevention of infection
D. Prevention of food spoilage -
- 2.
Match the term to the definition: Sterilization
- A.
The complete destruction of all microbes on an object
- B.
The reduction or inhibition of microbial growth on non-living surface
- C.
The reduction or inhibition of microbial growth on living tissue
Correct Answer
A. The complete destruction of all microbes on an object -
- 3.
Match the term to the definition: Disinfection
- A.
The complete destruction of all microbes on an object
- B.
The reduction or inhibition of microbial growth on non-living surface
- C.
The reduction or inhibition of microbial growth on living tissue
Correct Answer
B. The reduction or inhibition of microbial growth on non-living surface -
- 4.
Match the term to the definition: Antisepsis
- A.
The complete destruction of all microbes on an object
- B.
The reduction or inhibition of microbial growth on non-living surface
- C.
The reduction or inhibition of microbial growth on living tissue
Correct Answer
C. The reduction or inhibition of microbial growth on living tissue -
- 5.
Bacteria tend to die at a fixed exponential rate, meaning X^2(squared)
- A.
True
- B.
False
Correct Answer
A. True -
- 6.
Choose all those that are correct when asking how various agents harm bacteria.
- A.
Damage to cell wall
- B.
Alteration of membrane permeability
- C.
Damage to proteins and/or nucleic acids
- D.
Controlled by either physical or chemical agents
- E.
All of these
- F.
Only A, B, and C
Correct Answer
E. All of these -
- 7.
Heat can quickly denatures proteins, may damage the membrane by making it more fluid and denature DNA and RNA
- A.
True
- B.
False
Correct Answer
A. True -
- 8.
Boiling water kills most bacteria and viruses but how long does it take to kill each of these?
- A.
10 minutes for bacteria, 15 minutes for a virus
- B.
15 minutes for a bacteria, 25 minutes for a virus
- C.
10 minutes for a bacteria, 20 minutes for a virus
- D.
5 minutes for bacteria, 20 minutes for a virus
Correct Answer
C. 10 minutes for a bacteria, 20 minutes for a virus -
- 9.
Which of these is most popular in sterilizing culture media and lab instruments?
- A.
Autoclaving
- B.
Dry heat
- C.
Purell
- D.
Antiseptics
Correct Answer
A. Autoclaving -
- 10.
Pasteurization is the....
- A.
Short duration/high temperature treatment of food (72C for 15 seconds)
- B.
Long duration/low temperature treatment of food (12C for 3 hours)
- C.
Short duration/low temperature treatment of food (12C for 15 seconds)
- D.
Long duration/high temperature treatment of food (72C for 3 hours)
Correct Answer
A. Short duration/high temperature treatment of food (72C for 15 seconds) -
- 11.
Dry heat kills by oxidizing and can...
- A.
Denature protein and DNA
- B.
Slow the growth of bacteria
- C.
Inhibits growth of new bacteria
Correct Answer
A. Denature protein and DNA -
- 12.
What are two methods of dry heat?
- A.
Incineration (combustion)
- B.
Dry ovens
- C.
Heat lamp
- D.
Natual heat source (sun)
Correct Answer(s)
A. Incineration (combustion)
B. Dry ovens -
- 13.
A good example of dry is flaming a loop used to transfer bacteria to a petri plate
- A.
True
- B.
False
Correct Answer
A. True -
- 14.
COLD does not kill the microorganism but it will _______ bacterial growth.
Correct Answer
inhibit - 15.
Dessication is the......
- A.
Removal of water
- B.
Addition of water
Correct Answer
A. Removal of water -
- 16.
Dessication may help to stop growth, but doesn't necessarily kill bacteria.
- A.
True
- B.
False
Correct Answer
A. True -
- 17.
Many endospores are resistant to dessication
- A.
True
- B.
False
Correct Answer
A. True -
- 18.
Freeze drying also called lyophilizaiton is the...
- A.
Simultaneous combination of freezing and heating
- B.
Simultaneous combination of freezing and addition of water
- C.
Simultaneous combination of freezing and dessication
Correct Answer
C. Simultaneous combination of freezing and dessication -
- 19.
Filtration is the passage of a liquid through a filter that create a filtrate (microbes), there are membrane filters that can eliminate most bacteria, however,which of these statements is something that is not true of filtration.
- A.
Filters cannot help you obtain toxins that may be present
- B.
Filters can remove toxins that could be present
- C.
Filtration can help to separate microorganisms from a liquid
Correct Answer
B. Filters can remove toxins that could be present -
- 20.
Osmotic pressure treatment is the use of ____ and causes _____.
- A.
Salts, freeze drying
- B.
Ice, plasmolysis
- C.
Salts, plasmolysis
Correct Answer
C. Salts, plasmolysis -
- 21.
Radiation helps to kill bacteria which of these types of radiation are considered "ionizing" (Choose all that apply)
- A.
Gamma rays
- B.
UV
- C.
Microwaves
- D.
X-Rays
Correct Answer(s)
A. Gamma rays
D. X-Rays -
- 22.
Radiation kills bacteria in many ways, one of these is Non-ionizing which can be which of these? (Choose all that apply)
- A.
Gamma rays
- B.
UV
- C.
Microwaves
- D.
X-Rays
Correct Answer(s)
B. UV
C. Microwaves -
- 23.
Halogens are which of these (as it applies to us for this class)
- A.
Earth metals
- B.
Strong oxidizing agents
- C.
Non-earth metals
- D.
Weak oxidizing agents
Correct Answer
B. Strong oxidizing agents -
- 24.
Match the term to the statement: When chlorine is added to water, what forms is a strong oxidizing agent and disrupts enzymes.
- A.
Hypochlorite
- B.
Hypochlorous acid
- C.
Compressed chlorine gas
- D.
Bleach
Correct Answer
B. Hypochlorous acid -
- 25.
Match the term to this statement: The chemical choice in treatment of swimming pools.
- A.
Hypochlorite
- B.
Hypochlorous acid
- C.
Compressed chlorine gas
- D.
Bleach
Correct Answer
A. Hypochlorite -
- 26.
This is used in the disinfection of public drinking water and pools (using small quantities such as 1ppm)
- A.
Hypochlorite
- B.
Hypochlorous acid
- C.
Compressed chlorine gas
- D.
Bleach
Correct Answer
C. Compressed chlorine gas -
- 27.
This is a commonly used household disinfectant.
- A.
Sodium hypochlorite
- B.
Hypochlorous acid
- C.
Hypochlorite
Correct Answer
A. Sodium hypochloriteExplanation
Sodium hypochlorite is bleachRate this question:
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