Textbook Question
The endospores of which organism can be used as a biological indicator of sterilization?
a. Bacillus stearothermophilus
b. Salmonella enterica
c. Mycobacterium tuberculosis
d. Staphylococcus aureus
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11. Controlling Microbial Growth
Physical Methods to Control Microbial Growth
2:18 minutesProblem 1
Textbook Question
In practical terms in everyday use, which of the following statements provides the definition of sterilization?
a. Sterilization eliminates all organisms and viruses
b. Sterilization eliminates harmful microorganisms and viruses
c. Sterilization eliminates prions
d. Sterilization eliminates hyperthermophiles
Verified step by step guidance1
Step 1: Understand the concept of sterilization in microbiology. Sterilization is a process aimed at completely removing or destroying all forms of microbial life, including bacteria, viruses, fungi, and spores, from an object or environment.
Step 2: Analyze each option in the context of this definition. Option (a) states that sterilization eliminates all organisms and viruses, which aligns with the comprehensive removal of all microbial life.
Step 3: Consider option (b), which limits elimination to harmful microorganisms and viruses. This is more characteristic of disinfection, not sterilization, because sterilization is not selective and removes all microbes regardless of their harm.
Step 4: Evaluate option (c), which mentions elimination of prions. Prions are notoriously resistant to sterilization methods, so standard sterilization does not guarantee their removal.
Step 5: Review option (d), which focuses on hyperthermophiles. While sterilization may kill many organisms, it is not defined by targeting hyperthermophiles specifically.
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Video duration:
2mKey Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Definition of Sterilization
Sterilization is the process that destroys or removes all forms of microbial life, including bacteria, viruses, fungi, and spores. It ensures that an object or environment is completely free of any living microorganisms, making it safe for medical or laboratory use.
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Scope of Microbial Elimination
Sterilization targets all microorganisms, not just harmful or pathogenic ones. This includes both vegetative cells and resistant forms like bacterial spores, which are often more difficult to eliminate than regular microbes.
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Limitations Regarding Prions
Prions are infectious proteins that are highly resistant to conventional sterilization methods. Standard sterilization may not reliably eliminate prions, requiring specialized procedures, so sterilization does not always guarantee prion removal.
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