Microbiology: Media and Microbial Growth Control

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Which type of heat treatment is preferred for moisture-sensitive materials?

Tyndallization

Autoclaving

Moist Heat

Dry Heat (correct)

What is the primary purpose of sterilization in a microbial growth control context?

To lower microbial counts to safe public health levels

To mechanically remove microbes from a limited area

To inhibit or kill other microorganisms using antibiotics

To completely destroy all forms of microbial life, including endospores (correct)

What is the primary purpose of pasteurization in food processing?

To destroy vegetative pathogens on inanimate surfaces

To lower microbial counts to safe public health levels (correct)

To kill endospores of Clostridium botulinum in canned foods

To destroy vegetative pathogens on living tissue

What is the term for the destruction of vegetative pathogens on living tissue?

Antisepsis Signup and view all the answers

What is the term for the mechanical removal of microbes from a limited area?

Degerming Signup and view all the answers

What is the term for the application of treatment intended to lower microbial counts to safe public health levels?

Sanitization Signup and view all the answers

What is the primary purpose of Selective Media?

To suppress the growth of unwanted microbes while promoting desired ones Signup and view all the answers

Which type of media is used to grow Chemoautotrophs and Photoautotrophs?

Nonsynthetic/Complex Media Signup and view all the answers

What is the purpose of Differential Media?

To differentiate between various microorganisms Signup and view all the answers

Which type of media is used to cultivate Fastidious Organisms?

Enrichment Media Signup and view all the answers

What is the purpose of Nonsynthetic/Complex Media?

To encourage the growth of all microorganisms Signup and view all the answers

Which of the following is an example of Differential Media?

MacConkey Agar Signup and view all the answers

What is the mechanism of action of Cationic (+) detergents in sanitizing?

Protein denaturation and disruption of plasma membrane Signup and view all the answers

Which gaseous sterilant is commonly used due to its high penetration ability and is also carcinogenic?

Ethylene Oxide Signup and view all the answers

What is the purpose of using Biological Indicators in sterilization?

To check the efficacy of sterilization Signup and view all the answers

What is the mechanism of action of Biguanides, such as Chlorhexidine, in skin disinfection?

Disruption of plasma membrane Signup and view all the answers

Which method is commonly used to get pure cultures of microorganisms?

Streak Plate Method Signup and view all the answers

What is the classification of antibiotics that inhibit cell wall synthesis, such as Cephalosporins and Bacitracin?

Bactericidal Signup and view all the answers