Question Detail
Question
What is the primary mechanism by which UV-C light kills microorganisms?
Correct Answer
Option A is the correct answer.
Detailed Explanation
UV-C light causes damage to the nucleic acids (DNA and RNA) of microorganisms by forming pyrimidine dimers, particularly thymine dimers. These dimers interfere with DNA replication and transcription, leading to cell death. While other effects might occur, DNA/RNA damage is the primary lethal mechanism.
Hint
Consider what critical cellular components are most susceptible to high-energy radiation like UV-C.