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Practice Test

Microbiology - 3 Questions

1
Microbiology
Dry heat sterilization of paper points without incineration is accomplished at
1. 160C for 2hours
2. 120C for l hour
3. 100C for 2 hours
4. 200C for 1 hour

📝 Explanation:

Dry heat sterilization of paper points without incineration is accomplished at 160C for 2hours

2
Microbiology
The destruction of microorganisms on living tissues, as long as there is contact between the tissues and the antimicrobial agent, denotes
1. sterilization
2. antisepsis
3. sanitization
4. none of the above

📝 Explanation:

The destruction of microorganisms on living tissues, as long as there is contact between the tissues and the antimicrobial agent, denotes antisepsis (option 2). Antisepsis refers to the application of antimicrobial agents to living tissues to reduce the possibility of infection, sepsis, or putrefaction.

  1. Sterilization:

    • This is the process of completely eliminating all forms of microbial life, including bacteria, viruses, fungi, and spores, from an object or surface. Sterilization is typically achieved through methods such as autoclaving (steam under pressure), dry heat, chemical sterilants, or radiation. Sterilization is used for medical instruments, laboratory equipment, and other items that must be free of all microorganisms.

  2. Antisepsis:

    • Antisepsis refers to the application of antimicrobial agents to living tissues to reduce the risk of infection, sepsis, or putrefaction. Antiseptics are used on skin and mucous membranes to prevent infection during surgical procedures, wound care, and other medical interventions. Common antiseptics include alcohol, iodine solutions, and chlorhexidine.

  3. Sanitization:

    • Sanitization is the process of reducing the number of microorganisms on surfaces or objects to a level considered safe by public health standards. This does not necessarily eliminate all microorganisms but reduces them to a level that minimizes the risk of infection or disease. Sanitization is commonly used in food service, public restrooms, and other environments where hygiene is important.

3
Microbiology
Which of the following is an acidogenic genus found in deep dental caries, that often increases significantly in the saliva during periods of caries activity?
1.Lactobacillus
2.Candida
3. Actinomyces
4. Rothia

📝 Explanation:

Lactobacillus is an acidogenic genus found in deep dental caries, that often increases significantly in the saliva during periods of caries activity

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