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Chemical Composition and Culture Media in Microbiology

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Chemical Composition and Culture Media in Microbiology

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Questions and Answers

What is the process of a bacterial cell dividing into two daughter cells called?

Cellular meiosis

Mitosis

Binary fusion

Binary fission (correct)

Which of the following is NOT a factor that can affect microbial growth?

Temperature

pH level

Oxygen concentration

Presence of viruses (correct)

What is the key difference between sterilization and disinfection in terms of microbial control?

Disinfection is a preventive measure while sterilization is a curative measure.

Sterilization kills all microorganisms while disinfection only reduces their numbers. (correct)

Disinfection is used on living tissues while sterilization is used on inanimate objects.

Sterilization uses chemicals while disinfection uses heat.

Which type of bacteria requires an atmosphere with no oxygen for growth?

Obligate anaerobes Signup and view all the answers

What is the primary difference between sterilization and disinfection?

Sterilization kills all microorganisms, including spores, while disinfection kills most microbes but may not kill all spores. Signup and view all the answers

What is the optimum growth temperature for mesophiles?

25 - 40 degrees Celsius Signup and view all the answers

What is the term used to describe the increase in the number of bacterial cells through cell division?

Binary Fission Signup and view all the answers

What factor mainly determines the generation time (doubling time) of a bacterial cell?

Temperature Signup and view all the answers

Which of the following methods slows or stops bacterial growth by creating an environment with higher salt concentrations?

Hypertonic Solution Signup and view all the answers

How do acidophilic microbes and alkalophilic microbes differ in terms of pH preferences?

Acidophilic microbes thrive in acidic conditions. Signup and view all the answers