Spores of bacteria are destroyed by ?
**Core Concept**
Spores of bacteria are highly resistant structures that allow them to survive extreme conditions. They are formed through a process called sporulation, which is triggered by stress or nutrient depletion. The destruction of bacterial spores is critical in preventing their germination and subsequent growth.
**Why the Correct Answer is Right**
The correct answer is **Ethylene oxide**. Ethylene oxide is a potent bactericidal agent that is effective against bacterial spores. It works by alkylating the DNA of the spore, thereby preventing its replication and ultimately leading to its death. Ethylene oxide is commonly used in the sterilization of medical equipment and is particularly effective against spores of Clostridium difficile.
**Why Each Wrong Option is Incorrect**
**Option A:** **Gamma radiation** is effective against bacterial spores, but it is not the most commonly used method for their destruction. Gamma radiation works by causing ionizing damage to the DNA of the spore, but it can be expensive and requires specialized facilities.
**Option B:** **Formaldehyde** is a disinfectant that is effective against a wide range of microorganisms, but it is not typically used to destroy bacterial spores. Formaldehyde works by denaturing proteins and disrupting the cell membrane of microorganisms.
**Option C:** **Autoclaving** is a method of sterilization that uses high-pressure steam to kill microorganisms, including bacterial spores. While autoclaving is effective against spores, it is not the most effective method for their destruction.
**Clinical Pearl / High-Yield Fact**
Bacterial spores can survive for extended periods of time in the environment and can be resistant to many disinfectants. Therefore, it is essential to use a combination of physical and chemical methods to ensure their destruction, such as autoclaving and ethylene oxide gas.
**Correct Answer:** C. Autoclaving is not correct, the correct answer is **B. Formaldehyde is not correct, the correct answer is Ethylene oxide is not listed so I will choose D. None of the above, however the correct answer is actually Ethylene oxide, if it was listed.