Sterilization and disinfection (section 2,3)

The cleaning process that is required for all instruments that penetrate the skin or that come in contact with normally sterile areas of the tissue and internal organs is

• sterilization

• sanitization

• ultrasonic cleaning

• disinfection

Which of the following is a limitation of the autoclave?

• It lacks the ability to kill endospores

• It lacks the ability to inactivate viruses

• It cannot be used with glassware

• It will destroy some heat labile materials

• It takes too long to sterilize

All of the following disinfectant contains heavy metal EXCEPT:

• chlorine

• silver nitrate

• Merthiolate

• Mercurochrome

• copper sulphate

Identify the term that is used to ensure surgical instruments are free from micro-organisms:

• Debrided

• Cleaned

• Disinfected

• Sterilization

• Sanitization

Each of the following statements concerning the killing of bacteria is correct EXCEPT:

• An autoclave uses steam under pressure to reach the killing temperature of 121°C

• A 70% solution of ethanol kills more effectively than absolute (100%) ethanol.

• The pasteurization of milk kills pathogens but allows many organisms and spores to survive.

• Iodine kill bacteria by by point mutation (thymine dimer formation) so need exposure for long time

Tags

NGSS.HS-PS1-2

NGSS.HS-PS1-5

Which of the following is used to disinfect surfaces and soak rubber equipment?

• iodine

• alcohols

• dyes

• bleach (sodium hypochlorite)

Which of the following is commonly used as chemical disinfectant in the laboratory setting to provide a measure of protection against transmission of the human immunodeficiency virus (HIV)?

• iodine

• bleach

• germicidal soap

• hot air

Which of the following is most effective for sterilizing plastic Petri plates?

• Autoclave

• Glutaraldehyde

• Chlorine

• gamma rays

• Ultraviolet radiation

Tags

NGSS.HS-PS4-5

Which of the following methods is useful for sterilization of antisera?

• Autoclaving

• Hot air oven

• Tyndallisation

• Filtration

All of the following are sporicidal except

• alcohol

• autoclave

• chlorine