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
The primary mechanism by which UV-C light (ultraviolet light in the C wavelength range) kills microorganisms is by causing damage to their nucleic acids (DNA and RNA). UV-C light induces the formation of pyrimidine dimers (e.g., thymine dimers), which interfere with DNA replication and transcription, leading to genetic mutations and cell death.
Hint
Think about the effect of high-energy radiation on genetic material.