Bacterial spores are destroyed by
**Question:** Bacterial spores are destroyed by
A. Heat
B. Chemicals
C. Ultraviolet radiation
D. Antibiotics
**Core Concept:**
Bacterial spores are specialized forms of bacteria that can withstand harsh environmental conditions, such as extreme temperatures, desiccation, and chemical exposure. They are often formed in response to unfavorable conditions and can later germinate and resume growth when conditions improve.
**Why the Correct Answer is Right:**
Heat, specifically temperatures above 80°C, is effective in destroying bacterial spores due to the denaturation of proteins and enzymes within the spore, leading to irreversible damage and spore death.
**Why Each Wrong Option is Incorrect:**
B. Chemicals: Some chemicals can inactivate spores, but the correct answer (heat) is more effective and efficient.
C. Ultraviolet radiation: While UV light can damage bacterial DNA, heat remains more reliable for spore destruction due to the broader range of damage it causes.
D. Antibiotics: Antibiotics target bacterial cells, not spores, making them less effective in destroying spores.
**Clinical Pearl:**
Spore-forming bacteria, such as Bacillus anthracis (anthrax) and Clostridium difficile, can cause severe infections in humans. Heat treatment, such as pasteurization or autoclaving, effectively inactivates these spores, preventing potential diseases.
**Correct Answer:** C. Ultraviolet radiation