5
Answer: ASet 5: Text Structure (Advanced)
Explanation
PASSAGE
Mitochondrial DNA is inherited maternally. This unique inheritance pattern allows geneticists to trace maternal lineages back thousands of years to a theoretical 'Mitochondrial Eve'.
Which choice best describes the utility of the biological mechanism?
A. It serves as a historical record due to its specific mode of transmission.✓ Correct
B. It proves men have no DNA.
C. It explains why women survive longer.
D. It describes how to clone a human.
Detailed Explanation
Mechanism: Maternal inheritance. Utility: Trace lineages/History.
Key Evidence:
• "inherited maternally"
• "allows ... to trace ... back"
Why others are wrong: B (Mitochondrial only.), C (No survival data.), D (Tracing, not cloning.).