30 Questions
What is the preferred pH range for the growth of most microorganisms?
pH 7.0-7.4
What is the primary reason why bacteria die in a hypertonic environment?
Desiccation
Which type of microorganisms prefer an acidic environment?
Acidophiles
Which type of microbe thrives in environments with high atmospheric pressure?
Piezophiles
What is the result of osmosis on a human cell, such as a red blood cell?
Crenation
What is the term for microorganisms that prefer salty environments?
Halophilic
What is the term for the movement of a solvent through a permeable membrane?
Osmosis
What percentage of oxygen do microaerophiles require?
5% oxygen
What happens to obligate anaerobes in the presence of oxygen?
They are killed
What is the result of osmosis on a bacterial cell?
Plasmolysis
What is the typical atmospheric pressure in which most bacteria thrive?
14.7 psi
What is the effect of plasmolysis on bacterial cell growth and multiplication?
It inhibits growth
What is the term used to describe microorganisms that have complex nutritional requirements?
Fastidious
What type of medium is prepared in the laboratory by adding specific amounts of each component?
Chemically defined medium
Which type of medium contains ground up or digested extracts from animal organs and plants?
Complex medium
What is the purpose of enriched media in microbiology?
To promote the growth of fastidious organisms
What type of pathogens will not grow on artificial culture?
Obligate intracellular pathogens
What is the term used to describe media that are prepared in the laboratory?
Artificial media
What is the primary function of a selective medium in microbiology?
To inhibit the growth of certain organisms
What is the purpose of MacConkey agar in microbiology?
To differentiate between Gram-positive and Gram-negative bacteria
What is the primary difference between sterilization and disinfection?
Sterilization destroys all microorganisms, while disinfection reduces the number of microorganisms
What is the purpose of differential media in microbiology?
To differentiate between various types of microorganisms
Which of the following is an example of a situation where microbial growth is encouraged?
Culturing microorganisms in a laboratory
What is the purpose of sanitization in microbiology?
To reduce the number of microorganisms
Which of the following sterilization methods involves the use of steam under pressure?
Autoclaving
What is the primary purpose of disinfection in healthcare settings?
To eliminate most or all pathogens, except bacterial spores
What is the term for reducing microbial populations to safe levels in public health settings?
Sanitization
Which type of radiation is used in some healthcare facilities for sterilization?
Gamma rays
What is the term for eliminating all microorganisms from an object or surface?
Sterilization
What is the purpose of using ethylene oxide gas in healthcare facilities?
To sterilize equipment
Learn about the ideal pH levels for microbial growth, and how different microorganisms thrive in acidic or alkaline environments. Discover how acidophiles, fungi, and alkaliphiles adapt to different pH levels.
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