Question Detail
Question
What is the primary mechanism by which UV-C light kills microorganisms?
Correct Answer
Option D is the correct answer.
Detailed Explanation
UV-C light is germicidal primarily because its wavelengths are absorbed by DNA and RNA, leading to the formation of pyrimidine dimers. These dimers interfere with DNA replication and transcription, ultimately leading to cell death.
Hint
Consider the target molecule for UV radiation in a cell that is critical for replication and genetic information.