Final answer:
The endospores of Bacillus stearothermophilus are used to measure the effectiveness of autoclave sterilization due to their high resistance to extreme conditions, ensuring that an autoclave that can destroy these endospores is operating effectively.
Step-by-step explanation:
The endospores of Bacillus stearothermophilus are commonly used to measure the effectiveness of autoclave sterilization. This bacterium is highly resistant to the autoclaving process, so if the autoclave can destroy its endospores, it's likely to be effective against less resistant microorganisms. An autoclave works by applying heat and pressure to eradicate all forms of microbial life, including endospores which are some of the most difficult forms to destroy.
Bacillus stearothermophilus (also known as Geobacillus stearothermophilus) is a thermophilic bacterium, which means it thrives at high temperatures. Its endospores can withstand extreme environments, making them ideal biological indicators for checking the efficiency of autoclaves. If the autoclave can kill these robust endospores, it is operating correctly and ensuring a sterile environment.